1. Gastroenterology Department, Venizelion General Hospital, Heraklion, Crete-Greece
2. Gastroenterology, Hepatopancreatology, and Digestive Oncology, Erasme Hospital, Universite Libre de Bruxelles, Brussels, Belgium
3. Gastroenterology Service, Centre Hospitalier Universitaire de Charleroi, Charleroi, Belgium
4. APHM, Hôpital Nord, Marseille, France
5. St Mark's Hospital, Wolfson Unit for Endoscopy, North West London Hospitals University Trust, Harrow, London, UK
6. Department of Surgery, Zealand University Hospital, Denmark
7. Department of Gastroenterology, Digestive Endoscopy Unit, IRCCS Istituto Clinico Humanitas, Milan, Italy
8. Department of Gastroenterology and Hepatology, AG&M Research Institute, Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, The Netherlands
9. Department of Gastroenterology and Hepatology, Leiden University Medical Center, The Netherlands