1. Division of Gastroenterology, San Giovanni Battista University Teaching Hospital, Turin, Italy
2. Digestive Endoscopy Unit, Catholic University, Rome, Italy
3. Department of Gastroenterology, Chaim Sheba Medical Center, Sackler School of Medicine, Tel-Aviv University Tel-Hashomer, Israel
4. Klinik für Innere Medizin, Bethesda Krankenhaus Bergedorf, Hamburg, Germany
5. Department of Medicine II, Sana Klinikum, Offenbach, Germany
6. Department of Gastroenterology and Hepatology, VU University Medical Centre, Amsterdam, The Netherlands
7. Gastroenterology Unit, Ospedale Valduce, Como, Italy
8. Division of Gastroenterology, Shaare Zedek Medical Center, Jerusalem, Israel
9. Department of Medicine I, Johann Wolfgang Goethe University Frankfurt, Frankfurt, Germany
10. Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges-Pompidou, Service d'Hépato-gastro-entérologie, Paris, France
11. Medizinische Klinik, Evangelisches Krankenhaus, Düsseldorf, Germany
12. Department of Hepato-Gastroenterology, Nouvel Hôpital Civil, University Hospital of Strasbourg, Strasbourg, France
13. Royal Free Unit for Endoscopy and Centre for Gastroenterology, The Royal Free Hospital and University College London, London, UK
14. Department of Medicine B, University of Münster, Münster, Germany
15. Institute of Gastroenterology and Liver Diseases, Ha’emek Medical Center Afula, Israel, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology Haifa, Israel
16. Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
17. Gastroenterology Department, Centro Hospitalar do Alto Ave, Guimarães, Portugal.
18. Clinical Psychology Unit, Department of Psychology, University of Sheffield.
19. Centre Hospitalier Lyon Sud, Pierre Bénite, Lyon, France
20. Gedyt Endoscopy Center, Buenos Aires, Argentina