1. Digestive Endoscopy Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
2. Department of Gastroenterology and Hepatology, Theodor Bilharz Research Institute, Cairo, Egypt
3. Department of Gastroenterology, Hepatopancreatology and Digestive Oncology, Erasme Hospital, Université libre de Bruxelles (ULB), Brussels, Belgium
4. Department of Gastroenterology, IRCCS Humanitas Research Hospital, Rozzano, Italy
5. Department of Internal Medicine, Ostalb Klinikum Aalen, Aalen, Germany
6. Department of Hepatogastroenterology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
7. Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
8. Division of Gastroenterology, Department of Surgery, Transplantation and Gastroenterology, Semmelweis University, Budapest, Hungary
9. Department of Gastroenterology, University College London Hospital, London, UK
10. Medical Department II, Division of Gastroenterology, University of Leipzig Medical Center, Leipzig, Germany
11. Department of Gastroenterology, Georges-Pompidou European Hospital, Paris, France
12. Gastroenterology Department, Centro Hospitalar São João, Porto, Portugal
13. Department of Gastroenterology, Universitätsklinikum Augsburg, Augsburg, Germany
14. Division of Gastroenterology, Ulster Hospital, Dundonald, Belfast, Northern Ireland
15. Department of Gastroenterology and Hepatology, University Hospital Leuven, TARGID, KU Leuven, Leuven, Belgium