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, University of Copenhagen, Copenhagen, Denmark
5. Department of Gastroenterology, Digestive Endoscopy Unit, IRCCS Istituto Clinico Humanitas, Milan, Italy
6. Wolfson Unit for Endoscopy, St Mark’s Hospital & Imperial College, London, UK
7. Second Department of Surgery, Aretaieion University Hospital, Athens, Greece
8. Department of Gastroenterology and Hepatology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
9. Digestive Endoscopy Unit, Catholic University, Rome, Italy