I was born in Thessaloniki on 20/11/1980. I graduated from high school from the 2nd American College "Anatolia" of Thessaloniki in 1998 with grade "Excellent". In 1999 I registered at the the Aristotle University of Thessaloniki Medical School, from which I graduated in 2005 with grade "Very Good".

I served my military service from November 2005 till November 2006, as a Doctor and then started the mandatory rural medical service first with three months mandatory training in pathology, surgery and cardiology departments of the General Hospital of Chalkidiki from 4/7 to 3/10/2007 and then as a rural doctor at the Health Center of Kassandra 4-30/10/2007.

In November 2007 I started the specialty of surgery in 4th Department of General Surgery of A.U.TH., General Hospital ‘G. Papanikolaou” and I was awarded the Specialty Surgery medical license to practice in March 2014.

In the summer of 2014 I served as a doctor in the camp and then completed the compulsory medical rural service as a rural doctor in Peripheral Clinic of Kallirachis Thassos from 10/23/2014 - 06/15/2015. From 16.06.2015 - 19.10.2015 I served in the 2nd Department of Surgery in the General Hospital of Kavala where I actively participated in the clinical work of the department by performing many surgical operations.

I was placed in a position of Academic Fellow in Surgery and Attending Consultant Surgeon in the Medical School of AUTH on 11.01.2015 and since then participate in all clinical and nursing activities of 4th Department of General Surgery of A.U.TH., General Hospital ‘G. Papanikolaou”, and in the organization and operation of the above clinic. In 24.1.2022 I was elected

In November 2006, following written exams, I signed as 3rd in the Master of Science postgraduate program “Medical Research Methodology”, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki from which I graduated in December 2008 with grade "Excellent".

In 2009 the subject of my doctoral thesis entitled "The effect of combined administration of omega-3 and omega-6 fatty acids in ulcerative colitis. Experimental study in rats. " was announced by the Department of Medicine of AUTH. I completed my doctoral thesis at the Surgical Department of the Aristotle University of Thessaloniki in June 2014 after successful oral presenteion with grade "Excellent with Distinction" and received my PhD in November 2014, where I ranked first.

In November 2014, I signed for a second Master of Science postgraduate program “Surgery of Liver, Biliary Tree and Pancreas”, School of Medicine, Faculty of Health Sciences, Democritus University of Thrace from which I graduated in June 2016 with grade "Very Good", having ranked first.

At the same time, from 2007 to today I also participate in scientific, research, writing and teaching of the 4th Department of General Surgery of A.U.TH., with clinical courses and lectures to third-year, fourth-year and sixth-year students. My teaching experience dates back to September 2000, as assistant in the Laboratory of Descriptive Anatomy, School of Medicine, AUTH and continued at every stage of my scientific progress both within the Medical School of AUTH and beyond. In 2017 I was awarded the title of Instructor of the Hellenic Surgical Society. I have been a lecturer at 5 round table of an international conference and a lecturer or speaker or commentator a total of 65 times in Greek conferences or seminars. I was also a member of the organizing - scientific committees of 11 Greek and 1 international conference and chairman / coordinator of 7 meetings of Greek conferences.

I have received a total of 7 scholarships by scientific companies as well as 3 awards in conferences 2 international and 1 Greek. I am a member of 15 international and 3 Greek Medical Societies and 2 International Colleges of Surgery.

My research activity includes participation in 68 clinical trials, most of them international, and 3 as a national coordinator, while 1 is funded by the European Union and several experimental protocols, 3 of which I did. I have a total of 142 publications in ISI international journals, all on PubMed. My impact factor is 535,231, my H-Index index is 28 and my bibliography is 3743. I am a member of the editorial board of 21 journals and have been invited by 189 international journals to evaluate a total of 316 articles, and 2 publishers for the evaluation of 1 book and 1 book chapter. From November 2014 to October 2015 I was a research associate at the Department of Surgery Clinic, while since November 2015 I have been serving as a university fellow of the same clinic to conduct teaching, research, scientific and clinical work.

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• Paraskevas G, Ioannidis O, Papaziogas B, Natsis K, Spanidou S, Kitsoulis P. An accessory middle scalene muscle causing thoracic outlet syndrome. Folia Morphol (Warsz). 2007;66(3):194-7.
• Paraskevas G, Natsis K, Ioannidis O, Papaziogas B, Kitsoulis P, Spanidou S. Accessory muscles in the lower part of the anterior compartment of the arm that may entrap neurovascular elements. Clin Anat. 2008;21(3):246-51.
• Ioannidis O, Lavrentieva A, Botsios D. Nutrition support in acute pancreatitis. JOP. 2008;9(4):375-90.
• Paraskevas G, Papaziogas B, Ioannidis O, Kitsoulis P, Spanidou S. Double common bile duct: a case report. Acta Chir Belg. 2009;109(4):507-9.
• Ioannidis O, Cheva A, Kakoutis E, Rafail S, Kotronis A, Chatzopoulos S, Makrantonakis N. Primary myeloid sarcoma of the jejunum and greater omentum causing small intestine obstruction. Acta Gastroenterol Belg. 2009;72(3):369-72.
• Ioannidis O, Kakoutis E, Varnalidis I, Tamouridis G, Chatzichristou A, Tzarou V, Makrantonakis N. Giant cutaneous plasmacytoma of the sacrococcygeal region. J Cutan Med Surg. 2010;14(2):90-4.
• Ioannidis O, Stavrakis T, Cheva A, Papadimitriou N, Kotronis A, Kakoutis E, Makrantonakis N. Pilomatricoma of the arm with extensive ossification. Adv Med Sci. 2010;55(2):340-2.
• Ioannidis O, Papaemmanuil S, Kakoutis E, Papadopoulos G, Chatzopoulos S, Kotronis A, Makrantonakis N. Fibroepithelioma of pinkus in continuity with nodular basal cell carcinoma: supporting evidence of the malignant nature of the disease. Pathol Oncol Res. 2011;17(1):155-7.
• Ioannidis O, Cheva A, Stavrakis T, Paraskevas G, Papadimitriou N, Kakoutis E, Makrantonakis A. Sister Mary Joseph's nodule as the sole presenting sign of gastric signet ring cell adenocarcinoma. Gastroenterol Clin Biol. 2010;34(10):565-8.
• Paraskevas GK, Raikos A, Ioannidis O. Supernumerary semitendinosus muscle: A rare case presentation and its clinical significance. Clin Anat. 2010\;23(8):909-10.
• Ioannidis O, Styliani P, Kakoutis E, Rafail S, Chatzopoulos S, Konstantara A, Makrantonakis N. Strangulation of the vermiform appendix within a right inguinal hernia: a rare variation of Amyand's hernia. Am Surg. 2010;76(11):1305-6.
• Paraskevas G, Papaziogas B, Natsis K, Ioannidis O, Martoglou S, Economou D, Kitsoulis P. Accessory internal thoracic artery and its clinical significance. Chirurgia (Bucur). 2010;105(5):709-11.
• Paraskevas GK, Raikos A, Martoglou S, Ioannidis O. Sesamoid ossicles within the nuchal ligament: a report of two cases and review of the literature. J Radiol Case Rep. 2011;5(8):22-9.
• Ioannidis O, Papaemmanouil S, Chatzopoulos S, Paraskevas G, Konstantara A, Kotronis A, Kakoutis E, Makrantonakis A. Giant bilateral symptomatic adrenal myelolipomas associated with congenital adrenal hyperplasia. Pathol Oncol Res. 2011;17(3):775-8.
• Ioannidis O, Kakoutis E, Sakkas L, Konstantara A, Chatzopoulos S, Kotronis A, Makrantonakis N. Ingested toothpick fistula of the ileum mimicking Crohn's disease. Acta Gastroenterol Belg. 2010;73(4):527-9.
• Paraskevas GK, Ioannidis O, Raikos A, Papaziogas B, Natsis K, Spyridakis I, Kitsoulis P. High origin of a testicular artery: a case report and review of the literature. J Med Case Rep. 2011;5:75.
• Paraskevas G, Ioannidis O, Martoglou S. Cannieu-Riche anastomosis of the ulnar to median nerve in the hand: case report. Chirurgia (Bucur). 2010;105(6):839-42.
• Raikos A, Paraskevas GK, Yusuf F, Kordali P, Ioannidis O, Brand-Saberi B. Sternalis muscle: a new crossed subtype, classification, and surgical applications. Ann Plast Surg. 2011;67(6):646-8.
• Ioannidis O, Kakoutis E, Katsifa H, Rafail S, Chatzopoulos S, Kotronis A, Makrantonakis N. Streptococcus mutans: a rare cause of retroperitoneal abscess. Adv Med Sci. 2011;56(1):113-8.
• Ioannidis O, Cheva A, Kakoutis E, Chatzichristou A, Chatzopoulos S, Konstantara A, Papadimitriou N, Paraskevas G, Makrantonakis A. Mesothelial mesenteric cyst in patient with ascending colon cancer. Case report. G Chir. 2011;32(3):128-31.
• Ioannidis O, Varnalidis I, Paraskevas G, Botsios D. Nutritional modulation of the inflammatory bowel response. Digestion. 2011;84(2):89-101.
• Ioannidis O, Papaemmanouil S, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A, Kakoutis E. Pathologic Rupture of the Spleen as the Presenting Symptom of Primary Splenic Non- Hodgkin Lymphoma. J Gastrointest Cancer. 2011 Apr 26. PMID: 21519811.
• Paraskevas GK, Raikos A, Ioannidis O, Brand-Saberi B. Topographic anatomy of the internal laryngeal nerve: surgical considerations. Head Neck. 2012;34(4):534-40.
• Ioannidis O, Dalampini E, Chatzopoulos S, Kotronis A, Paraskevas G, Konstantara A, Papadimitriou N, Makrantonakis A, Kakoutis E. Acute respiratory failure caused by neglected giant substernal nontoxic goiter. Arq Bras Endocrinol Metabol. 2011;55(3):229-32.
• Ioannidis O, Kakoutis E, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A. Emphysematous cellulitis of the left thigh caused by sigmoid diverticulum perforation. Ann Ital Chir. 2011;82(3):217-20.
• Paraskevas GK, Ioannidis O. Accessory muscles around the superior radioulnar joint: a morphological study. Ital J Anat Embryol. 2011;116(1):45-51.
• Kalfadis S, Ioannidis O, Botsios D, Lazaridis C. Subcapsular liver biloma due to gallbladder perforation after acute cholecystitis. J Dig Dis. 2011;12(5):412- 4.
• Paraskevas GK, Ioannidis O. Variable course and drainage pattern of the right testicular vein: Embryological aspects. Clin Anat. 2011;24(8):988-90.
• Ioannidis O, Papaemmanouil S, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Makrantonakis A, Kakoutis E. Primary Signet Ring Cell Anal Adenocarcinoma. J Gastrointest Cancer. 2012;43 Suppl 1:S168-70.
• Varnalidis I, Ioannidis O, Karamanavi E, Ampas Z, Poutahidis T, Taitzoglou I, Paraskevas G, Botsios D. Omega 3 fatty acids supplementation has an ameliorative effect in experimental ulcerative colitis despite increased colonic neutrophil infiltration. Rev Esp Enferm Dig. 2011;103(10):511-8.
• Ioannidis O, Cheva A, Kakoutis E, Athina K, Nikolaos P, Stergios R, Makrantonakis N. Acute adult intussusception caused by primary cecal non Hodgkin lymphoma. Acta Gastroenterol Belg. 2011;74(3):451-3.
• Paraskevas GK, Raikos A, Ioannidis O, Papaziogas B. Duplicated gallbladder: surgical application and review of the literature. Ital J Anat Embryol. 2011;116(2):61-6.
• Ioannidis O, Sekouli A, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A, Kakoutis E. Long term follow up of eosinophilic granuloma of the rib. Klin Onkol. 2011;24(6):460-4.
• Ioannidis O, Papaemmanouil S, Paraskevas G, Kotronis A, Chatzopoulos S, Konstantara A, Papadimitriou N, Makrantonakis A, Kakoutis E. Recurrent small intestine intussusception in a patient with Peutz-Jeghers syndrome. Rev Esp Enferm Dig. 2012;104(1):37-9.
• Ioannidis O, Paraskevas G, Kotronis A, Chatzopoulos S, Konstantara A, Papadimitriou N, Makrantonakis A, Kakoutis E. Spontaneous cholecystocutaneous fistula draining from an abdominal scar from previous surgical drainage. Ann Ital Chir. 2012;83(1):67-9.
• Ioannidis O, Pasteli N, Paraskevas G, Chatzopoulos S, Papadimitriou N, Kotronis A, Konstantara A, Makrantonakis A, Kakoutis E. Lymphoepithelioma-like gastric carcinoma presenting as giant ulcer of the lesser curvature: case report. G Chir. 2012;33(1-2):21-3.
• Ioannidis O, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A, Kakoutis E. Multiple desmoid tumors in a patient with familial adenomatous polyposis caused by the novel W421X mutation. Rev Esp Enferm Dig. 2012;104(3):146-50.
• Ioannidis O, Iordanidis F, Fidanis T, Chatzopoulos S, Kotronis A, Paraskevas G, Konstantara A, Papadimitriou N, Makrantonakis A, Kakoutis E. Duodenal gastrointestinal stromal tumor presenting with acute upper gastrointestinal bleeding treated with segmental resection. Klin Onkol. 2012;25(2):130-4.
• Ioannidis O, Cheva A, Paraskevas G, Kotronis A, Papadimitriou N, Chatzopoulos S, Konstantara A, Makrantonakis A, Sakkas A, Kakoutis E. Basosquamous Cell Carcinoma of the Anus. J Gastrointest Cancer. 2012;43 Suppl 1:S184-6.
• Sartelli M, Catena F, Ansaloni L, Leppaniemi A, Taviloglu K, van Goor H, Viale P, Lazzareschi DV, de Werra C, Marrelli D, Colizza S, Scibé R, Alis H, Torer N, Navarro S, Catani M, Kauhanen S, Augustin G, Sakakushev B, Massalou D, Pletinckx P, Kenig J, Di Saverio S, Guercioni G, Rausei S, Laine S, Major P, Skrovina M, Angst E, Pittet O, Gerych I, Tepp J, Weiss G, Vasquez G, Vladov N, Tranà C, Vettoretto N, Delibegovic S, Dziki A, Giraudo G, Pereira J, Poiasina E, Tzerbinis H, Hutan M, Vereczkei A, Krasniqi A, Seretis C, Diaz- Nieto R, Mesina C, Rems M, Campanile FC, Agresta F, Coletta P, Uotila- Nieminen M, Dente M, Bouliaris K, Lasithiotakis K, Khokha V, Zivanović D, Smirnov D, Marinis A, Negoi I, Ney L, Bini R, Leon M, Aloia S, Huchon C, Moldovanu R, de Melo RB, Giakoustidis D, Ioannidis O, Cucchi M, Pintar T, Jovine E. Complicated intra-abdominal infections in Europe: preliminary data from the first three months of the CIAO Study. World J Emerg Surg. 2012;7(1):15.
• Ioannidis O, Cheva A, Paraskevas G, Papadimitriou N, Konstantara A, Chatzopoulos S, Kotronis A, Makrantonakis A, Kakoutis E. Pseudomyxoma retroperitonei: report of 2 cases and review of the literature. Rev Esp Enferm Dig. 2012;104(5):268-75.
• Ioannidis O, Paraskevas G, Kotronis A, Chatzopoulos S, Konstantara A, Papadimitriou N, Makrantonakis A, Kakoutis E. Surgical management of severe spontaneous hemorrhage of the abdominal wall complicating acenocoumarol treatment. Acta Medica (Hradec Kralove). 2012;55(1):47-9.
• Dellinger EP, Forsmark CE, Layer P, Lévy P, Maraví-Poma E, Petrov MS, Shimosegawa T, Siriwardena AK, Uomo G, Whitcomb DC, Windsor JA; Pancreatitis Across Nations Clinical Research and Education Alliance (PANCREA). Determinant-based classification of acute pancreatitis severity: an international multidisciplinary consultation. Ann Surg. 2012;256(6):875-80.
• Paraskevas GK, Ioannidis O, Economou DS. Anomalous muscle causing ulnar nerve compression at Guyon's canal. J Plast Surg Hand Surg. 2012;46(3-4):288- 90.
• Paraskevas G, Natsis K, Tzika M, Ioannidis O, Kitsoulis P. Abnormal origin of internal thoracic artery from the thyrocervical trunk: surgical considerations. J Cardiothorac Surg. 2012;7:63.
• Ioannidis O, Trellopoulos G, Tamouridis G, Konstantinidis K, Megalopoulos A. A single-centre experience of the treatment of ruptured abdominal aortic aneurysms: clinical and anatomic characteristics of open versus endovascular repair. Int Angiol. 2012;31(4):386-92.
• Ioannidis O, Paraskevas G, Kakoutis E, Kotronis A, Papadimitriou N, Chatzopoulos S, Makrantonakis A. Coexistence of multiple omphalomesenteric duct anomalies. J Coll Physicians Surg Pak. 2012;22(8):524-6.
• Paraskevas GK, Ioannidis O, Natsis K, Martoglou S. Abnormal bilateral drainage of testicular veins: embryological aspects and surgical application. Rom J Morphol Embryol. 2012;53(3):635-8.
• Ioannidis O, Iordanidis F, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A, Kakoutis E. Omental metastases from primary lung adenocarcinoma. Rev Invest Clin. 2012;64(3):308-10.
• Ioannidis O, Varnalidis I, Papapostolou D, Chatzopoulos S, Kotronis A, Paraskevas G, Konstantara A, Papadimitriou N, Makrantonakis A, Kakoutis E. Thoraco-abdominal injuries: the general surgeon's perspective. Rev Med Chir Soc Med Nat Iasi. 2012;116(1):175-81.
• Ioannidis O, Cheva A, Paraskevas G, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A, Kakoutis E. Neuroendocrine tumor of the cystic duct. Acta Gastroenterol Belg. 2012;75(3):357-60.
• Sartelli M, Catena F, Ansaloni L, Leppaniemi A, Taviloglu K, van Goor H, Viale P, Lazzareschi DV, Coccolini F, Corbella D, de Werra C, Marrelli D, Colizza S, Scibè R, Alis H, Torer N, Navarro S, Sakakushev B, Massalou D, Augustin G, Catani M, Kauhanen S, Pletinckx P, Kenig J, Di Saverio S, Jovine E, Guercioni G, Skrovina M, Diaz-Nieto R, Ferrero A, Rausei S, Laine S, Major P, Angst E, Pittet O, Herych I, Agresta F, Vettoretto N, Poiasina E, Tepp J, Weiss G, Vasquez G, Vladov N, Tranà C, Delibegovic S, Dziki A, Giraudo G, Pereira J, Tzerbinis H, van Dellen D, Hutan M, Vereczkei A, Krasniqi A, Seretis C, Mesina C, Rems M, Campanile FC, Coletta P, Uotila-Nieminen M, Dente M, Bouliaris K, Lasithiotakis K, Khokha V, Zivanovic D, Smirnov D, Marinis A, Negoi I, Ney L, Bini R, Leon M, Aloia S, Huchon C, Moldovanu R, de Melo RB, Giakoustidis D, Ioannidis O, Cucchi M, Pintar T, Krivokapic Z, Petrovic J. Complicated intra-abdominal infections in Europe: a comprehensive review of the CIAO study. World J Emerg Surg. 2012;7(1):36.
• Paraskevas GK, Tsitsopoulos PP, Ioannidis OM. Incidence and purpose of the clival canal, a "neglected" skull base canal. Acta Neurochir (Wien). 2013;155(1):139-40.
• Ioannidis O, Sekouli A, Paraskevas G, Kotronis A, Chatzopoulos S, Papadimitriou N, Konstantara A, Makrantonakis A, Kakoutis E. Intra- abdominal heterotopic ossification of the peritoneum following traumatic splenic rupture. J Res Med Sci. 2012;17(1):92-5.
• Ioannidis O, Iordanidis F, Paraskevas G, Ntoumpara M, Tsigkriki L, Chatzopoulos S, Kotronis A, Papadimitriou N, Konstantara A, Makrantonakis A, Sakkas A, Kakoutis E. Incidentally discovered white subcupsular liver nodules during laparoscopic surgery: biliary hamartoma and peribiliary gland hamartoma. Klin Onkol. 2012;25(6):468-70.
• Paraskevas GK, Natsis K, Anastasopoulos N, Ioannidis O, Kitsoulis P. Humeral septal aperture associated with supracondylar process: a case report and review of the literature. Ital J Anat Embryol. 2012;117(3):135-41.
• Ioannidis O, Paraskevas G, Varnalidis I, Ntoumpara M, Tsigkriki L, Gatzos S, Malakozis SG, Papapostolou D, Papadopoulou A, Makrantonakis A, Makrantonakis. Primary gallbladder cancer discovered postoperatively after elective and emergency cholecystectomy. Klin Onkol. 2013;26(1):31-4.
• Ioannidis O, Sekouli A, Paraskevas G, Papadimitriou N, Konstantara A, Kotronis A, Chatzopoulos S, Makrantonakis A, Kakoutis E. Metachronous early gastric adenocarcinoma presenting coinstantaneously with complete remission of stage IV gastric MALT lymphoma. Arab J Gastroenterol. 2013;14(1):20-3.
• Layer P, Dellinger EP, Forsmark CE, Lévy P, Maraví-Poma E, Shimosegawa T, Siriwardena AK, Uomo G, Whitcomb DC, Windsor JA, Petrov MS; Pancreatitis Across Nations Clinical Research and Education Alliance (PANCREA). [Determinant-based classification of acute pancreatitis severity. International multidisciplinary classification of acute pancreatitis severity: the 2013 German edition]. Z Gastroenterol 2013;51:544-50.
• Maraví-Poma E, Patchen Dellinger E, Forsmark CE, Layer P, Lévy P, Shimosegawa T, Siriwardena AK, Uomo G, Whitcomb DC, Windsor JA, Petrov MS; Pancreatitis Across Nations Clinical Research and Education Alliance (PANCREA). [International multidisciplinary classification of acute pancreatitis severity: the 2013 Spanish edition]. Med Intensiva 2014;38:211-7.
• Paraskevas GK, Natsis K, Tzika M, Ioannidis O. Potential entrapment of an accessory superficial peroneal sensory nerve at the lateral malleolus: a cadaveric case report and review of the literature. J Foot Ankle Surg. 2014;53(1):92-5.
• Ioannidis O, Anastasilakis CD, Varnalidis I, Paraskevas G, Malakozis SG, Gatzos S, Ntoumpara M, Tsigkriki L, Papapostolou D, Makrantonakis A, Papadopoulou A, Makrantonakis N. Intraperitoneal administration of local anesthetics in laparoscopic surgery: pharmacological, anatomical, physiological and pathophysiological considerations. Minerva Chir 2013;68:599-612.
• Anastasilakis CD, Ioannidis O, Gkiomisi AI, Botsios D. Artificial nutrition and intestinal mucosal barrier functionality. Digestion 2013;88:193-208.
• Ioannidis O, Paraskevas G, Varnalidis I, Ntoumpara M, Tsigkriki L, Gatzos S, Malakozis S, Papapostolou D, Papadopoulou A, Makrantonakis A, Makrantonakis N. Hernia mesh repair of the anterior abdominal wall and antibiotic chemoprophylaxis: multiple doses of antibiotics failed to prevent or reduce wound infection. Chirurgia (Bucur) 2013;108:835-9.
• Paraskevas GK, Natsis K, Ioannidis O. Accessory cleido-occipitalis muscle: case report and review of the literature. Rom J Morphol Embryol. 2013;54(3 Suppl):893-5.
• Ioannidis O, Papaziogas B, Tsiaousis P, Paraskevas G, Giamarellos-Bourboulis EJ, Koutelidakis I. Effect of moxifloxacin on the survival, lipid peroxidation and inflammation of immunosuppressed rats with soft tissue infection from Stenotrophomonas maltophilia. Microbiol Immunol 2014;58:96-102.
• Varnalidis I, Ioannidis O, Paraskevas G, Papapostolou D, Malakozis SG, Gatzos S, Tsigkriki L, Ntoumpara M, Papadopoulou A, Makrantonakis A, Makrantonakis N. Pilonidal sinus: a comparative study of treatment methods. J Med Life 2014;7:27-30.
• Paraskevas GK, Natsis K, Tzika M, Ioannidis O. Fascial entrapment of the sural nerve and its clinical relevance. Anat Cell Biol 2014;47(2):144-7.
• Paraskevas G, Natsis K, Ioannidis O, Kitsoulis P, Anastasopoulos N, Spyridakis I. Multiple variations of the superficial jugular veins: case report and clinical relevance. Acta Medica (Hradec Kralove) 2014;57:34-7.
• Sapidis N, Tziouvaras C, Ioannidis O, Kalaitsidou I, Botsios D. The effect of glutamine and synbiotics on the healing of colonic anastomosis. Rev Esp Enferm Dig 2014;106:255-62.
• Sartelli M, Abu-Zidan FM, Catena F, Griffiths EA, Di Saverio S, Coimbra R, Ordoñez CA, Leppaniemi A, Fraga GP, Coccolini F, Agresta F, Abbas A, Abdel Kader S, Agboola J, Amhed A, Ajibade A, Akkucuk S, Alharthi B, Anyfantakis D, Augustin G, Baiocchi G, Bala M, Baraket O, Bayrak S, Bellanova G, Beltràn MA, Bini R, Boal M, Borodach AV, Bouliaris K, Branger F, Brunelli D, Catani M, Che Jusoh A, Chichom-Mefire A, Cocorullo G, Colak E, Costa D, Costa S, Cui Y, Curca GL, Curry T, Das K, Delibegovic S, Demetrashvili Z, Di Carlo I, Drozdova N, El Zalabany T, Enani MA, Faro M, Gachabayov M, Giménez Maurel T, Gkiokas G, Gomes CA, Gonsaga RA, Guercioni G, Guner A, Gupta S, Gutierrez S, Hutan M, Ioannidis O, Isik A, Izawa Y, Jain SA, Jokubauskas M, Karamarkovic A, Kauhanen S, Kaushik R, Kenig J, Khokha V, Kim JI, Kong V, Koshy R, Krasniqi A, Kshirsagar A, Kuliesius Z, Lasithiotakis K, Leão P, Lee JG, Leon M, Lizarazu Pérez A, Lohsiriwat V, López-Tomassetti Fernandez E, Lostoridis E, Mn R, Major P, Marinis A, Marrelli D, Martinez-Perez A, Marwah S, McFarlane M, Melo RB, Mesina C, Michalopoulos N, Moldovanu R, Mouaqit O, Munyika A, Negoi I, Nikolopoulos I, Nita GE, Olaoye I, Omari A, Ossa PR, Ozkan Z, Padmakumar R, Pata F, Pereira Junior GA, Pereira J, Pintar T, Pouggouras K, Prabhu V, Rausei S, Rems M, Rios-Cruz D, Sakakushev B, Sánchez de Molina ML, Seretis C, Shelat V, Simões RL, Sinibaldi G, Skrovina M, Smirnov D, Spyropoulos C, Tepp J, Tezcaner T, Tolonen M, Torba M, Ulrych J, Uzunoglu MY, van Dellen D, van Ramshorst GH, Vasquez G, Venara A, Vereczkei A, Vettoretto N, Vlad N, Yadav SK, Yilmaz TU, Yuan KC, Zachariah SK, Zida M, Zilinskas J, Ansaloni L. Global validation of the WSES Sepsis Severity Score for patients with complicated intra-abdominal infections: a prospective multicentre study (WISS Study). World J Emerg Surg 2015;10:61.
• Ioannidis O, Varnalidis I, Alexandris K, Anastasiadou C, Megalopoulos A. Double primary venous aneurysm of the small saphenous vein. Ann Ital Chir 2016;87. pii: S2239253X16026177.
• International Surgical Outcomes Study group. Global patient outcomes after elective surgery: prospective cohort study in 27 low-, middle- and high-income countries. Br J Anaesth. 2016;117(5):601-609.
• Coccolini F, Montori G, Ceresoli M, Catena F, Ivatury R, Sugrue M, Sartelli M, Fugazzola P, Corbella D, Salvetti F, Negoi I, Zese M, Occhionorelli S, Maccatrozzo S, Shlyapnikov S, Galatioto C, Chiarugi M, Demetrashvili Z, Dondossola D, Yovtchev Y, Ioannidis O, Novelli G, Nacoti M, Khor D, Inaba K, Demetriades D, Kaussen T, Jusoh AC, Ghannam W, Sakakushev B, Guetta O, Dogjani A, Costa S, Singh S, Damaskos D, Isik A, Yuan KC, Trotta F, Rausei S, Martinez-Perez A, Bellanova G, Fonseca VC, Hernández F, Marinis A, Fernandes W, Quiodettis M, Bala M, Vereczkei A, Curado RL, Fraga GP, Pereira BM, Gachabayov M, Chagerben GP, Arellano ML, Ozyazici S, Costa G, Tezcaner T, Ansaloni L. IROA: International Register of Open Abdomen, preliminary results. World J Emerg Surg 2017;12:10.
• Kalfadis S, Nalbanti V, Ioannidis O, Porfiriou G, Botsios D, Tsalis K Variations of renal tissue oxygenation during abdominal compartment syndrome and sepsis. Adv Med Sci 2017;62:177-185.
• Kahan BC, Koulenti D, Arvaniti K, Beavis V, Campbell D, Chan M, Moreno R, Pearse RM; International Surgical Outcomes Study (ISOS) group. Critical care admission following elective surgery was not associated with survival benefit: prospective analysis of data from 27 countries. Intensive Care Med 2017;43(7):971-979.
• Ahmad T, Bouwman RA, Grigoras I, Aldecoa C, Hofer C, Hoeft A, Holt P, Fleisher LA, Buhre W, Pearse RM; International Surgical Outcomes Study (ISOS) group. Use of failure-to-rescue to identify international variation in postoperative care in low-, middle- and high-income countries: a 7-day cohort study of elective surgery. Br J Anaesth. 2017;119(2):258-266.
• Szakmany T, Ditai J, Kirov M, Protsenko D, Osinaike B, Venara A, Demartines N, Hubner M, Pearse RM, Prowle JR; International Surgical Outcomes Study (ISOS) group. In-hospital clinical outcomes after upper gastrointestinal surgery: Data from an international observational study. Eur J Surg Oncol 2017;43(12):2324-2332.
• Ioannidis O, Kitsikosta L, Tatsis D, Skandalos I, Cheva A, Gkioti A, Varnalidis I, Symeonidis S, Savvala NA, Parpoudi S, Paraskevas GK, Pramateftakis MG, Kotidis E, Mantzoros I, Tsalis KG. Fournier's Gangrene: Lessons Learned from Multimodal and Multidisciplinary Management of Perineal Necrotizing Fasciitis. Front Surg 2017;4:36.
• Sartelli M, Labricciosa FM, Barbadoro P, Pagani L, Ansaloni L, Brink AJ, Carlet J, Khanna A, Chichom-Mefire A, Coccolini F, Di Saverio S, May AK, Viale P, Watkins RR, Scudeller L, Abbo LM, Abu-Zidan FM, Adesunkanmi AK, Al-Dahir S, Al-Hasan MN, Alis H, Alves C, Araujo da Silva AR, Augustin G, Bala M, Barie PS, Beltrán MA, Bhangu A, Bouchra B, Brecher SM, Caínzos MA, Camacho-Ortiz A, Catani M, Chandy SJ, Jusoh AC, Cherry-Bukowiec JR, Chiara O, Colak E, Cornely OA, Cui Y, Demetrashvili Z, De Simone B, De Waele JJ, Dhingra S, Di Marzo F, Dogjani A, Dorj G, Dortet L, Duane TM, Elmangory MM, Enani MA, Ferrada P, Esteban Foianini J, Gachabayov M, Gandhi C, Ghnnam WM, Giamarellou H, Gkiokas G, Gomi H, Goranovic T, Griffiths EA, Guerra Gronerth RI, Haidamus Monteiro JC, Hardcastle TC, Hecker A, Hodonou AM, Ioannidis O, Isik A, Iskandar KA, Kafil HS, Kanj SS, Kaplan LJ, Kapoor G, Karamarkovic AR, Kenig J, Kerschaever I, Khamis F, Khokha V, Kiguba R, Kim HB, Ko WC, Koike K, Kozlovska I, Kumar A, Lagunes L, Latifi R, Lee JG, Lee YR, Leppäniemi A, Li Y, Liang SY, Lowman W, Machain GM, Maegele M, Major P, Malama S, Manzano-Nunez R, Marinis A, Martinez Casas I, Marwah S, Maseda E, McFarlane ME, Memish Z, Mertz D, Mesina C, Mishra SK, Moore EE, Munyika A, Mylonakis E, Napolitano L, Negoi I, Nestorovic MD, Nicolau DP, Omari AH, Ordonez CA, Paiva JA, Pant ND, Parreira JG, Pędziwiatr M, Pereira BM, Ponce-de-Leon A, Poulakou G, Preller J, Pulcini C, Pupelis G, Quiodettis M, Rawson TM, Reis T, Rems M, Rizoli S, Roberts J, Pereira NR, Rodríguez-Baño J, Sakakushev B, Sanders J, Santos N, Sato N, Sawyer RG, Scarpelini S, Scoccia L, Shafiq N, Shelat V, Sifri CD, Siribumrungwong B, Søreide K, Soto R, de Souza HP, Talving P, Trung NT, Tessier JM, Tumbarello M, Ulrych J, Uranues S, Van Goor H, Vereczkei A, Wagenlehner F, Xiao Y, Yuan KC, Wechsler-Fördös A, Zahar JR, Zakrison TL, Zuckerbraun B, Zuidema WP, Catena F. The Global Alliance for Infections in Surgery: defining a model for antimicrobial stewardship-results from an international cross-sectional survey. World J Emerg Surg 2017;12:34.
• Despoudi K, Mantzoros I, Ioannidis O, Cheva A, Antoniou N, Konstantaras D, Symeonidis S, Pramateftakis MG, Kotidis E, Angelopoulos S, Tsalis K. Effects of albumin/glutaraldehyde glue on healing of colonic anastomosis in rats. World J Gastroenterol 2017;23(31):5680-5691.
• Global Alliance for Infections in Surgery Working Group. A Global Declaration on Appropriate Use of Antimicrobial Agents across the Surgical Pathway. Surg Infect (Larchmt). 2017;18(8):846-853.
• Mantzoros I, Savvala NA, Ioannidis O, Parpoudi S, Loutzidou L, Kyriakidou D, Cheva A, Intzos V, Tsalis K. Midgut neuroendocrine tumor presenting with acute intestinal ischemia. World J Gastroenterol 2017;23(45):8090-8096.
• Abbott TEF, Ahmad T, Phull MK, Fowler AJ, Hewson R, Biccard BM, Chew MS, Gillies M, Pearse RM; International Surgical Outcomes Study (ISOS) group. The surgical safety checklist and patient outcomes after surgery: a prospective observational cohort study, systematic review and meta-analysis. Br J Anaesth 2018;120(1):146-155.
• GlobalSurg Collaborative. Surgical site infection after gastrointestinal surgery in high-income, middle-income, and low-income countries: a prospective, international, multicentre cohort study. Lancet Infect Dis 2018;18(5):516-525.
• Sartelli M, Baiocchi GL, Di Saverio S, Ferrara F, Labricciosa FM, Ansaloni L, Coccolini F, Vijayan D, Abbas A, Abongwa HK, Agboola J, Ahmed A, Akhmeteli L, Akkapulu N, Akkucuk S, Altintoprak F, Andreiev AL, Anyfantakis D, Atanasov B, Bala M, Balalis D, Baraket O, Bellanova G, Beltran M, Melo RB, Bini R, Bouliaris K, Brunelli D, Castillo A, Catani M, Che Jusoh A, Chichom-Mefire A, Cocorullo G, Coimbra R, Colak E, Costa S, Das K, Delibegovic S, Demetrashvili Z, Di Carlo I, Kiseleva N, El Zalabany T, Faro M, Ferreira M, Fraga GP, Gachabayov M, Ghnnam WM, Giménez Maurel T, Gkiokas G, Gomes CA, Griffiths E, Guner A, Gupta S, Hecker A, Hirano ES, Hodonou A, Hutan M, Ioannidis O, Isik A, Ivakhov G, Jain S, Jokubauskas M, Karamarkovic A, Kauhanen S, Kaushik R, Kavalakat A, Kenig J, Khokha V, Khor D, Kim D, Kim JI, Kong V, Lasithiotakis K, Leão P, Leon M, Litvin A, Lohsiriwat V, López-Tomassetti Fernandez E, Lostoridis E, Maciel J, Major P, Dimova A, Manatakis D, Marinis A, Martinez-Perez A, Marwah S, McFarlane M, Mesina C, Pędziwiatr M, Michalopoulos N, Misiakos E, Mohamedahmed A, Moldovanu R, Montori G, Mysore Narayana R, Negoi I, Nikolopoulos I, Novelli G, Novikovs V, Olaoye I, Omari A, Ordoñez CA, Ouadii M, Ozkan Z, Pal A, Palini GM, Partecke LI, Pata F, Pędziwiatr M, Pereira Júnior GA, Pintar T, Pisarska M, Ploneda-Valencia CF, Pouggouras K, Prabhu V, Ramakrishnapillai P, Regimbeau JM, Reitz M, Rios-Cruz D, Saar S, Sakakushev B, Seretis C, Sazhin A, Shelat V, Skrovina M, Smirnov D, Spyropoulos C, Strzałka M, Talving P, Teixeira Gonsaga RA, Theobald G, Tomadze G, Torba M, Tranà C, Ulrych J, Uzunoğlu MY, Vasilescu A, Occhionorelli S, Venara A, Vereczkei A, Vettoretto N, Vlad N, Walędziak M, Yilmaz TU, Yuan KC, Yunfeng C, Zilinskas J, Grelpois G, Catena F. Prospective Observational Study on acute Appendicitis Worldwide (POSAW). World J Emerg Surg.2018;13:19.
• Kotidis E, Ioannidis O, Pramateftakis MG, Christou K, Kanellos I, Tsalis K. Atypical anastomotic malignancies of small bowel after subtotal gastrectomy with Billorth II gastroenterostomy for peptic ulcer: Report of three cases and review of the literature. World J Gastrointest Oncol 2018;10(7):194-201.
• Kotidis E, Strati TM, Triantafyllou E, Ioannidis O, Pramateftakis MG, Mantzoros I, Loutzidou L, Kanellos I, Tsalis K. Laparoscopic Resection of Desmoid Type Fibromatosis of the Splenic Hilum Mimicking a Greater Curvature Gastric GIST. J Coll Physicians Surg Pak 2018;28(9):714-716.
• Ioannidis O, Chatzidelios C, Mantzoros I, Tatsis D, Kitsikosta L, Chatzakis C, Makrantonakis A, Paraskevas G, Kotidis E, Pramateftakis MG, Tsalis K. Polymetastatic highly aggressive Small Cell Undifferentiated Neuroendocrine Carcinoma of Ascending Colon. Cir Cir 2018;86(5):446-449.
• Kotidis E, Stamatiou I, Ioannidis O, Pramateftakis MG, Kanellos I, Tsalis K. Laparoscopic resection of large pelvic lipoma causing obstructive uropathy in a 66 year old female - A case report from Greece. J Pak Med Assoc 2018;68(9):1400-1402.
• Tsalis K, Parpoudi S, Kyziridis D, Ioannidis O, Savvala NA, Antoniou N, Symeonidis S, Konstantaras D, Mantzoros I, Pramateftakis MG, Kotidis E, Angelopoulos S. Klatskin tumors and "Klatskin-mimicking lesions": our 22- year experience. Rev Esp Enferm Dig 2019;111(2):121-128.
• Megalopoulos A, Ioannidis O, Varnalidis I, Ntoumpara M, Tsigriki L, Alexandris K, Anastasiadou C, Styliani P, Paraskevas G, Mantzoros I. High prevalence of abdominal aortic aneurysm in patients with inguinal hernia. Aortic aneurysm in inguinal hernia patients. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2019;163(3):247-252.
• GlobalSurg Collaborative. Pooled analysis of WHO Surgical Safety Checklist use and mortality after emergency laparotomy. Br J Surg. 2019;106(2):e103- e112.
• Coccolini F, Ceresoli M, Kluger Y, Kirkpatrick A, Montori G, Salvetti F, Fugazzola P, Tomasoni M, Sartelli M, Ansaloni L, Catena F, Negoi I, Zese M, Occhionorelli S, Shlyapnikov S, Galatioto C, Chiarugi M, Demetrashvili Z, Dondossola D, Ioannidis O, Novelli G, Nacoti M, Khor D, Inaba K, Demetriades D, Kaussen T, Jusoh AC, Ghannam W, Sakakushev B, Guetta O, Dogjani A, Costa S, Singh S, Damaskos D, Isik A, Yuan KC, Trotta F, Rausei S, Martinez-Perez A, Bellanova G, Fonseca V, Hernández F, Marinis A, Fernandes W, Quiodettis M, Bala M, Vereczkei A, Curado R, Fraga GP, Pereira BM, Gachabayov M, Chagerben GP, Arellano ML, Ozyazici S, Costa G, Tezcaner T, Porta M, Li Y, Karateke F, Manatakis D, Mariani F, Lora F, Sahderov I, Atanasov B, Zegarra S, Gianotti L, Fattori L, Ivatury R. Open abdomen and entero-atmospheric fistulae: An interim analysis from the International Register of Open Abdomen (IROA). Injury. 2019;50(1):160-166.
• Mantzoros I, Kyriakidou D, Galanos-Demiris K, Chatzakis C, Parpoudi S, Sapidis N, Loutzidou L, Ioannidis O, Angelopoulos S, Tsalis KG. A Rare Case of Primary Hyperparathyroidism Caused by a Giant Solitary Parathyroid Adenoma. Am J Case Rep 2018;19:1334-1337.
• Tsalis K, Ioannidis O, Cheva A, Antigoni Savvala N, Antoniou N, Parpoudi S, Kyziridis D, Tatsis D, Konstantaras D, Kitsikosta L, George Pramateftakis M, Kotidis E, Avgerinos A, Mantzoros I. A 20-year single center experience in the surgical treatment of colorectal liver metastasis. J BUON. 2018; 23(6):1640- 1647.
• Fowler AJ, Ahmad T, Abbott TEF, Torrance HD, Wouters PF, De Hert S, Lobo SM, Rasmussen LS, Della Rocca G, Beattie WS, Wijeysundera DN, Pearse RM; International Surgical Outcomes Study Group. Association of preoperative anaemia with postoperative morbidity and mortality: an observational cohort study in low-, middle-, and high-income countries. Br J Anaesth. 2018;121(6):1227-1235.
• Gkasdaris G, Birbilis T, Ioannidis O, Tsalis K. An incidental intracranial lesion in a young woman with head trauma: The key role of CT bone reconstruction in the diagnosis of an osteoma of the anterior cranial fossa. Clin Case Rep 2019;7(3):595-596.
• Sugrue M, Coccolini F, Bucholc M, Johnston A; Contributors from WSES. Intra-operative gallbladder scoring predicts conversion of laparoscopic to open cholecystectomy: a WSES prospective collaborative study. World J Emerg Surg 2019;14:12.
• International Surgical Outcomes Study (ISOS) group. Prospective observational cohort study on grading the severity of postoperative complications in global surgery research. Br J Surg 2019;106(2):e73-e80.
• Paraskevas GK, Koutsouflianiotis KN, Iliou K, Syrmos N, Ioannidis O, Noussios G. Costoclavicular Joint: An Osteological Study on Clavicles with Clinical Relevance. Cureus 2019; 11:e4409.
• Sartelli M, Abu-Zidan FM, Labricciosa FM, Kluger Y, Coccolini F, Ansaloni L, Leppäniemi A, Kirkpatrick AW, Tolonen M, Tranà C, Regimbeau JM, Hardcastle T, Koshy RM, Abbas A, Aday U, Adesunkanmi ARK, Ajibade A, Akhmeteli L, Akın E, Akkapulu N, Alotaibi A, Altintoprak F, Anyfantakis D, Atanasov B, Augustin G, Azevedo C, Bala M, Balalis D, Baraket O, Baral S, Barkai O, Beltran M, Bini R, Bouliaris K, Caballero AB, Calu V, Catani M, Ceresoli M, Charalampakis V, Jusoh AC, Chiarugi M, Cillara N, Cuesta RC, Cobuccio L, Cocorullo G, Colak E, Conti L, Cui Y, De Simone B, Delibegovic S, Demetrashvili Z, Demetriades D, Dimova A, Dogjani A, Enani M, Farina F, Ferrara F, Foghetti D, Fontana T, Fraga GP, Gachabayov M, Gérard G, Ghnnam W, Maurel TG, Gkiokas G, Gomes CA, Guner A, Gupta S, Hecker A, Hirano ES, Hodonou A, Hutan M, Ilaschuk I, Ioannidis O, Isik A, Ivakhov G, Jain S, Jokubauskas M, Karamarkovic A, Kaushik R, Kenig J, Khokha V, Khokha D, Kim JI, Kong V, Korkolis D, Kruger VF, Kshirsagar A, Simões RL, Lanaia A, Lasithiotakis K, Leão P, Arellano ML, Listle H, Litvin A, Lizarazu Pérez A, Lopez-Tomassetti Fernandez E, Lostoridis E, Luppi D, Machain V GM, Major P, Manatakis D, Reitz MM, Marinis A, Marrelli D, Martínez-Pérez A, Marwah S, McFarlane M, Mesic M, Mesina C, Michalopoulos N, Misiakos E, Moreira FG, Mouaqit O, Muhtaroglu A, Naidoo N, Negoi I, Nikitina Z, Nikolopoulos I, Nita GE, Occhionorelli S, Olaoye I, Ordoñez CA, Ozkan Z, Pal A, Palini GM, Papageorgiou K, Papagoras D, Pata F, Pędziwiatr M, Pereira J, Pereira Junior GA, Perrone G, Pintar T, Pisarska M, Plehutsa O, Podda M, Poillucci G, Quiodettis M, Rahim T, Rios-Cruz D, Rodrigues G, Rozov D, Sakakushev B, Sall I, Sazhin A, Semião M, Sharda T, Shelat V, Sinibaldi G, Skicko D, Skrovina M, Stamatiou D, Stella M, Strzałka M, Sydorchuk R, Teixeira Gonsaga RA, Tochie JN, Tomadze G, Ugoletti L, Ulrych J, Ümarik T, Uzunoglu MY, Vasilescu A, Vaz O, Vereczkei A, Vlad N, Walędziak M, Yahya AI, Yalkin O, Yilmaz TU, Ünal AE, Yuan KC, Zachariah SK, Žilinskas J, Zizzo M, Pattonieri V, Baiocchi GL, Catena F. Physiological parameters for Prognosis in Abdominal Sepsis (PIPAS) Study: a WSES observational study. World J Emerg Surg 2019;14:34.
• Chaudery H, MacDonald N, Ahmad T, Chandra S, Tantri A, Sivasakthi V, Mansor M, Matos R, Pearse RM, Prowle JR; International Surgical Outcomes Study (ISOS) Group. Acute Kidney Injury and Risk of Death After Elective Surgery: Prospective Analysis of Data From an International Cohort Study. Anesth Analg 2019;128(5):1022-1029.
• Montroni I, Rostoft S, Spinelli A,. Van Leeuwen BL, Ercolani G,. Saur NM, Jacklitsh MT,. Somasundar PS, de Liguori Carino N, Ghignone F, Foca F, Zingaretti C, Audisio RA, Ugolini G, The SIOG surgical task force/ESSO GOSAFE study group (Collaborators: Garutti A, Taffurelli G, Zattoni D, Tramelli P, Sermonesi G, Di Candido F, Carvello M, Sacchi M, De Lucia F, Foppa C, Plas M, Van der Wal-Huisman H, Tauceri F, Perenze B, Di Pietrantonio D, Mirarchi M, Fejka M, Bleier JIS, Frain L, Fox SW, Cardin K, De Leon LE, Baltatzis M, Chan AKC, Siriwardena AK, Vertogen B, Nanni O, Garulli G, Alagna V, Pirrera B, Lucchi A, Monari F, Conti L, Capelli P, Romboli A, Palmieri G, Banchini F, Marano L, Spaziani A, Castagnoli G, Bartoli A, Trompetto M, Gallo G, Luc AR, Clerico G, Sammarco G, De Luca R, Barile G, Simone M, Costanzi A, Mari G, Maggioni M, Pellegrino R, Riggio V, Kenig J, Szabat K, Scabini S, Pertile D, Stratta E, Massobrio A, Soriero D, Nesbakken A, Lønn M, Backe IF, Ferrari G, Mazzola M, Alampi BDA, Achilli P, Sfondrini S, Ioannidis O, Loutzidou L, Galanos-Demiris K, Pellino G, Balducci G, Frezza B, Lucarini A, Santos C, Cooper L, Siam B, Levy Y, Brenner B, Kashtan H, Belgrano V, De Cian F, Palermo B, Eggenhöffner R, Albertelli M, Sánchez-Guillén L, Arroyo A, López-Rodríguez F, Lario S, Lillo C, Wexner SD). GOSAFE - Geriatric Oncology Surgical Assessment and Functional rEcovery after Surgery: early analysis on 977 patients. J Geriatr Oncol 2020;11(2):244-255.
• Angelopoulos S, Ioannidis O, Mantzoros I, Pramateftakis MG, Kotidis E, Kitsikosta L, Kyriakidou D, Tsalis K. Duodenal Injuries During Laparoscopic Cholecystectomy: An Unusual But Serious Complication of a Routine Surgical Procedure. Chirurgia (Bucur) 2019; 114(4): 518-521.
• Vasiliadis K, Ioannidis O, Tsalis K. Benign tumors and pseudotumors within the porta hepatis masquerading perihilar cholangiocarcinoma. Klin Onkol 2019;32(6):411-425.
• Ceresoli M, Salvetti F, Kluger Y, Braga M, Viganò J, Fugazzola P, Sartelli M, Ansaloni L, Catena F, Coccolini F; IROA study group. Open Abdomen in Obese Patients: Pay Attention! New Evidences from IROA, the International Register of Open Abdomen. World J Surg 2020;44(1):53-62.
• Tartaglia D, Di Saverio D, Stupalkowska W, Giannessi S, Robustelli V; Coccolini F, Ioannidis O, Nita GE, Muñoz-Cruzado VMD, Ciuró FP, Chiarugi M. Laparoscopic peritoneal lavage versus laparoscopic sigmoidectomy in perforated acute diverticulitis: a multicenter prospective observational study. International Journal of Colorectal Disease. Int J Colorectal Dis 2019;34(12):2111-2120.
• Ypsilantis P, Lambropoulou M, Anagnostopoulos K, Panidou-Tsoulou E, Ioannidis O, Totsi A, Pitiakoudis M, Simopoulos C. Effect of laparoscopic liver resection versus the open technique on hepatocyte regenerating activity in the rat. Surg Endosc 2020;34(11):4812-4817.
• Varnalidis I, Ioannidis O, Papadopoulou A, Poutahidis T, Taitzoglou I, Ampas Z, Chatzakis C, Galanos-Demiris K, Mantzoros I, Pramateftakis MG, Kotidis E, Angelopoulos S, Botsios D, Tsalis K. Synbiotics administration leads to attenuated mucosal inflammatory neutrophil infiltration and increased hematocrit in experimental ulcerative colitis. Cir Cir 2020;88(4):410-419.
• Odisseos C, Ioannidis O, Chatzakis C, Symeonidis S, Bitsianis S, Christidis P, Loutzidou L, Mantzoros I, Kotidis E, Pramateftakis MG, Angelopoulos S, Tsalis K. The effect of hepatic ischemia in the liver of rats with obstructive jaundice. Ann Ital Chir. 2020;91:334-344.
• Lambrou I, Mantzoros I, Ioannidis O, Tatsis D, Chasampalioti M, Bitsianis S, Pramateftakis MG, Kotidis E, Ouzounidis N, Angelopoulos S, Dimitriadis C, Tsalis K. The effect of chemotherapy with 5-fluorouracil, bleomycin and cisplatin in the healing of colonic anastomoses in rats. Ann Ital Chir. 2020;91:552-562.
• De Simone B, Ansaloni L, Sartelli M, Kluger Y, Abu-Zidan FM, Biffl WL, Heyer A, Coccolini F, Baiocchi GL; OBA trial supporters, Catena F. The Operative management in Bariatric Acute abdomen (OBA) Survey: long-term complications of bariatric surgery and the emergency surgeon's point of view. World J Emerg Surg 2020;15(1):2.
• Pramateftakis MG, Kotidis E, Gkantsinikoudis N, Ioannidis O, Aggelopoulos S, Tsalis K. Robotic-assisted repair of perineal hernia after laparoscopic abdominoperineal excision using a bioresorbable mesh - a video vignette. Colorectal Dis. 2020;22(8):972-973.
• Papaconstantinou D, Garoufalia Z, Kykalos S, Nastos C, Tsapralis D, Ioannidis O, Michalinos A, Chatzimavroudis G, Schizas D. Implications of the presence of the vermiform appendix inside an inguinal hernia (Amyand's hernia): a systematic review of the literature. Hernia 2020;24(5):951-959.
• COVIDSurg Collaborative. Elective surgery cancellations due to the COVID-19 pandemic: global predictive modelling to inform surgical recovery plans. Br J Surg 2020;107(11):1440-1449.
• Demcsák A, Soós A, Kincses L, Capunge I, Minkov G, Kovacheva- Slavova M, Nakov R, Wu D, Huang W, Xia Q, Deng L, Hollenbach M, Schneider A, Hirth M, Ioannidis O, Vincze Á, Bajor J, Sarlós P, Czakó L, Illés D, Izbéki F, Gajdán L, Papp M, Hamvas J, Varga M, Kanizsai P, Bóna E, Mikó A, Váncsa S, Juhász MF, Ocskay K, Darvasi E, Miklós E, Erőss B, Szentesi A, Párniczky A, Casadei R, Ricci C, Ingaldi C, Mastrangelo L, Jovine E, Cennamo V, Marino MV, Barauskas G, Ignatavicius P, Pelaez-Luna M, Rios AS, Turcan S, Tcaciuc E, Małecka-Panas E, Zatorski H, Nunes V, Gomes A, Gonçalves TC, Freitas M, Constantino J, Sá M, Pereira J, Mateescu B, Constantinescu G, Sandru V, Negoi I, Ciubotaru C, Negoita V, Bunduc S, Gheorghe C, Barbu S, Tantau A, Tantau M, Dumitru E, Suceveanu AI, Tocia C, Gherbon A, Litvin A, Shirinskaya N, Rabotyagova Y, Bezmarevic M, Hegyi PJ, Han J, Rodriguez- Oballe JA, Salas IM, Comas EP, Garcia DI, Cuadrado AJ, Castiñeira AQ, Chang YT, Chang MC, Kchaou A, Tlili A, Kacar S, Gökbulut V, Duman D, Kani HT, Altintas E, Chooklin S, Chuklin S, Gougol A, Papachristou G, Hegyi P. Acid suppression therapy, gastrointestinal bleeding and infection in acute pancreatitis - An international cohort study. Pancreatology 2020;20(7):1323- 1331.
• Coccolini F, Gubbiotti F, Ceresoli M, Tartaglia D, Fugazzola P, Ansaloni L, Sartelli M, Kluger Y, Kirkpatrick A, Amico F, Catena F, Chiarugi M; IROA study group. Open Abdomen and Fluid Instillation in the Septic Abdomen: Results from the IROA Study. World J Surg 2020;44(12):4032- 4040.
• Rausei S, Pappalardo V, Ceresoli M, Catena F, Sartelli M, Chiarugi M, Kluger Y, Kirkpatrick A, Ansaloni L, Coccolini F; IROA study Group. Open abdomen management for severe peritonitis in elderly. Results from the prospective International Register of Open Abdomen (IROA): Cohort study. Int J Surg 2020;82:240-244.
• COVIDSurg Collaborative. Delaying surgery for patients with a previous SARS-CoV-2 infection. Br J Surg 2020;107(12):e601-e602.
• Vascular and Endovascular Research Network (VERN) COVER study collaborative*. Global impact of the first coronavirus disease 2019 (COVID-19) pandemic wave on vascular services. Br J Surg 2020;107(11):1396-1400.
• Glasbey JC, Nepogodiev D, Simoes JFF, Omar O, Li E, Venn ML, Pgdme, Abou Chaar MK, Capizzi V, Chaudhry D, Desai A, Edwards JG, Evans JP, Fiore M, Videria JF, Ford SJ, Ganly I, Griffiths EA, Gujjuri RR, Kolias AG, Kaafarani HMA, Minaya-Bravo A, McKay SC, Mohan HM, Roberts KJ, San Miguel-Méndez C, Pockney P, Shaw R, Smart NJ, Stewart GD, Sundar Mrcog S, Vidya R, Bhangu AA; COVIDSurg Collaborative. Elective Cancer Surgery in COVID-19-Free Surgical Pathways During the SARS-CoV-2 Pandemic: An International, Multicenter, Comparative Cohort Study. J Clin Oncol 2021;39(1):66-78.
• Ielpo B, Podda M, Pellino G, Pata F, Caruso R, Gravante G, Di Saverio S; ACIE Appy Study Collaborative. Global attitudes in the management of acute appendicitis during COVID-19 pandemic: ACIE Appy Study. Br J Surg. 2020 Oct 8:10.1002/bjs.11999. doi: 10.1002/bjs.11999.
• COVIDSurg Collaborative. Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic. Colorectal Dis. 2020 Nov 15:10.1111/codi.15431. doi: 10.1111/codi.15431.
• GlobalSurg Collaborative. Surgical site infection after gastrointestinal surgery in children: an international, multicentre, prospective cohort study. BMJ Glob Health 2020;5(12):e003429.
• Reichert M, Sartelli M, Weigand MA, Doppstadt C, Hecker M, Reinisch-Liese A, Bender F, Askevold I, Padberg W, Coccolini F, Catena F, Hecker A; WSES COVID-19 emergency surgery survey collaboration group. Impact of the SARS-CoV-2 pandemic on emergency surgery services-a multi- national survey among WSES members. World J Emerg Surg 2020;15(1):64.
• COVIDSurg Collaborative. Head and neck cancer surgery during the COVID-19 pandemic: An international, multicenter, observational cohort study. Cancer 2021;127(14):2476-2488.
• Kotidis E, Bitsianis S, Galanos-Demiris K, Christidis P, Mantzoros I, Ioannidis O, Foutsitzis V, Pramateftakis MG, Aggelopoulos S. Case Report: A Virilizing Adrenal Oncocytoma. Front Surg 2021;8:646459.
• GlobalSurg Collaborative and National Institute for Health Research Global Health Research Unit on Global Surgery. Global variation in postoperative mortality and complications after cancer surgery: a multicentre, prospective cohort study in 82 countries. Lancet 2021;397(10272):387-397.
• Spota A, Al-Taher M, Felli E, Morales Conde S, Dal Dosso I, Moretto G, Spinoglio G, Baiocchi G, Vilallonga R, Impellizzeri H, Martin-Martin GP, Casali L, Franzini C, Silvestri M, de Manzini N, Castagnola M, Filauro M, Cosola D, Copaescu C, Garbarino GM, Pesce A, Calabrò M, de Nardi P, Anania G, Carus T, Boni L, Patané A, Santi C, Saadi A, Rollo A, Chautems R, Noguera J, Grosek J, D'Ambrosio G, Ferreira CM, Norcic G, Navarra G, Riva P, Quaresima S, Paganini A, Rosso N, De Paolis P, Balla A, Sauvain MO, Gialamas E, Bianchi G, La Greca G, Castoro C, Picchetto A, Franchello A, Tartamella L, Juvan R, Ioannidis O, Kosir JA, Bertani E, Stassen L, Marescaux J, Diana M. Fluorescence-based bowel anastomosis perfusion evaluation: results from the IHU-IRCAD-EAES EURO-FIGS registry. Surg Endosc 2021. doi: 10.1007/s00464-020-08234-8. Online ahead of print.
• Coccolini F, Kluger Y, Moore EE, Maier RV, Coimbra R, Ordoñez C, Ivatury R, Kirkpatrick AW, Biffl W, Sartelli M, Hecker A, Ansaloni L, Leppaniemi A, Reva V, Civil I, Vega F, Chiarugi M, Chichom-Mefire A, Sakakushev B, Peitzman A, Chiara O, Abu-Zidan F, Maegele M, Miccoli M, Chirica M, Khokha V, Sugrue M, Fraga GP, Otomo Y, Baiocchi GL, Catena F; and the WSES Trauma Quality Indicators Expert Panel. Trauma quality indicators: internationally approved core factors for trauma management quality evaluation. World J Emerg Surg 2021;16(1):6.
• Ioannidis O, Mariorakis C, Malliora A, Christidis P, Loutzidou L, Mantzoros I, Pramateftakis MG, Kotidis E, Ouzounidis N, Foutsitzis V, Aggelopoulos S. Transdiaphragmatic Intercostal Hernia-An Unusual Hepatic Injury After a Car Accident: A Case Report and Review of the Literature. Discoveries (Craiova) 2021;9(1):e123.
• COVIDSurg Collaborative; GlobalSurg Collaborative. Timing of surgery following SARS-CoV-2 infection: an international prospective cohort study. Anaesthesia 2021;76(6):748-758.
• COVIDSurg Collaborative, GlobalSurg Collaborative. SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study. Br J Surg 2021:znab101. doi: 10.1093/bjs/znab101. Online ahead of print.
• COVIDSurg Collaborative Co-authors. Machine learning risk prediction of mortality for patients undergoing surgery with perioperative SARS-CoV-2: the COVIDSurg mortality score. Br J Surg 2021:znab183. doi: 10.1093/bjs/znab183. Online ahead of print.
• Wan YI, Patel A, Achary C, Hewson R, Phull M, Pearse RM; International Surgical Outcomes Study (ISOS) Group. Postoperative infection and mortality following elective surgery in the International Surgical Outcomes Study (ISOS). Br J Surg 2021;108(2):220-227.
• Pellino G, Podda M, Pata F, Di Saverio S, Ielpo B, ACIE Appy Study Collaborative. Inequalities in screening policies and perioperative protection for patients with acute appendicitis during the pandemic: Subanalysis of the ACIE Appy study. Br J Surg, DOI: 10.1093/bjs/znab247.
• COVIDSurg Collaborative; GlobalSurg Collaborative. Effects of pre- operative isolation on postoperative pulmonary complications after elective surgery: an international prospective cohort study. Anaesthesia 2021. doi: 10.1111/anae.15560.
• Despoudi K, Mantzoros I, Ioannidis O, Loutzidou L, Christidis P, Chatzakis C, Gkasdaris G, Raptis D, Pramateftakis MG, Angelopoulos S, Zaraboukas T, Koliakos G, Tsalis K. Healing of colonic anastomosis in rats under obstructive ileus conditions. Discoveries (Craiova) 2021; 9(2): e129.
• Ioannidis O, Malliora A, Mantzoros I, Loutzidou L, Pramateftakis MG, Kotidis E, Ouzounidis N, Foutsitzis V, Angelopoulos S, Tsalis K. A rare case of gastroesophageal adenocarcinoma in a 24-year-old male with achalasia complicated by postoperative aortoesophageal fistula due to stent placement and early local recurrence. Klin Onkol. 2021;34(4):309-12.
• Angelopoulos S, Ioannidis O, Ouzounidis N, Mariorakis C, Chatzakis C, Symeonidis S, Mantzoros I, Kotidis E, Pramateftakis MG, Tsalis K. Variations of plasma levels of insulin, glucagon, amylase and glucose and histopathological lesions of pancreatic tissue after complete elimination of exocrine pancreatic function with surgical ligation versus prolamine occlusion. Ann Ital Chir [Accepted].
• Lambrou I, Ioannidis O, Manztoros I, Tatsis D, Chasampalioti M, Varnalidis I, Pramateftakis MG, Kotidis E, Ouzounidis N, Angelopoulos S, Zaramboukas T, Demetriades H, Tsalis K. The effects of growth hormone on the healing of colonic anastomoses in rats. Ann Ital Chir [Accepted].

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