1. Gastroenterology Department, Colentina Clinical Hospital, Bucharest, Romania
2. Internal Medicine Department, Carol Davila School of Medicine, Bucharest, Romania
3. Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
4. Università Cattolica del Sacro Cuore, Centre for Endoscopic Research Therapeutics and Training (CERTT), Rome, Italy
5. University Hospital Centre, Zagreb, Croatia
6. Gastroenterology Department, Zadar General Hospital, Zadar, Croatia
7. Endoscopy Division, Cantacuzino Clinical Hospital, Bucharest, Romania
8. Clinic for Gastroenterology and Hepatology, University of Belgrade Medical School, Belgrade, Serbia