1. Gastroenterology Department, Benizelion General Hospital, Heraklion, Crete, Greece
2. Gedyt Endoscopy Center, Buenos Aires, Argentina
3. LBA UMR T24, Faculty of Medicine, Aix-Marseille University, Marseille, France
4. Endoscopy Unit, Digestive Disease Center, Bispebjerg Hospital, Copenhagen, Denmark
5. Department of Gastroenterology, Digestive Endoscopy Unit, IRCCS Istituto Clinico Humanitas, Milan, Italy
6. Wolfson Unit for Endoscopy, Imperial College London, St Mark’s Hospital and Academic Institute, London, UK
7. Second Department of Surgery, Aretaieion University Hospital, Athens, Greece
8. Department of Gastroenterology and Hepatology, C2–330, Academic Medical Center, University of Amsterdam
9. Digestive Endoscopy Unit, Catholic University, Rome, Italy