1. Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
2. Centre Hospitalier Universitaire de l’Archet, Pôle digestif, Nice, France
3. Department of Radiology, Maastricht University Medical Center, The Netherlands
4. Department of Gastroenterology and Hepatology, Indiana University Medical Center, Indianapolis, Indiana, United States
5. UBC Division of Gastroenterology, Vancouver General Hospital, Vancouver, Canada
6. Gedyt Endoscopy Center, Buenos Aires, Argentina
7. Mount Vernon Cancer Centre, Northwood, Middlesex, UK
8. Digestive Endoscopy Unit, Catholic University, Rome, Italy
9. Endoscopy Unit, Gastroenterology Department, Complejo Hospitalario de Navarra, Pamplona, Spain
10. Endoscopy Unit, Digestive Disease Center, Bispebjerg University Hospital, Copenhagen, Denmark
11. Division of Gastroenterology and Hepatology, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California, United States
12. Royal College of Surgeons of England, London UK
13. Department of Digestive and Oncological Surgery, University Hospital of Amiens, France
14. Department of Colorectal Surgery, Royal Surrey County Hospital, Guildford, UK
15. Department of Surgery, Academic Medical Center, Amsterdam, The Netherlands
16. Department of Gastroenterology, Onze-Lieve-Vrouwziekenhuis, Aalst, Belgium
17. Department of Gastroenterology, University College Hospital, London, UK
18. Department of Gastroenterology and Endoscopy, Guido Salvini Hospital, Garbagnate Milanese/Rho, Milan, Italy
19. Department of Gastroenterology, Hôpital Nord, Aix Marseille Université, Marseille, France
20. Digestive Endoscopy Unit, Istituto Clinico Humanitas, Milan, Italy