1. Digestive Endoscopy Unit, Catholic University, Rome, Italy
2. Department of Gastroenterology and Hepatology, Nantes University, Nantes, France
3. Department of Gastroenterology, Evangelisches Krankenhaus, Düsseldorf, Germany
4. Service of Gastroenterology and Hepatology, Geneva University Hospitals, Geneva, Switzerland
5. Department of Gastroenterology, Bikur Holim Hospital; Jerusalem, Israel
6. Department of Gastroenterology, Royal Free and University College Medical School, London, UK
7. Department of Hepato-Gastroenterology, CHU Strasbourg, Strasbourg, France
8. Division of Gastroenterology 2, San Giovanni Battista University Teaching Hospital, Turin, Italy
9. Department of Gastroenterology, Indiana University Hospital, Indianapolis, USA
10. Department of Gastroenterology, Avicenne Hospital, University of Paris, Bobigny, France
11. Gastroenterology Unit, Luigi Sacco University Hospital, Milan, Italy
12. Department of Gastroenterology, Erasme Hospital, Université Libre de Bruxelles, Brussels, Belgium
13. Chaim Sheba Medical Center, Tel-Aviv, Israel
14. Department of Gastroenterology, St Mark's Hospital, London, UK
15. Department of Medicine I, Altona General Hospital, Hamburg, Germany
16. Gastroenterology Service, Virgen Macarena University Hospital, Seville, Spain
17. Clinic for Internal Medicine, Bethesda Krankenhaus Bergedorf, Hamburg, Germany
18. Department of Gastroenterology and Clinical Nutrition Service, Royal Melbourne Hospital, Melbourne, Australia
19. Digestive Endoscopy Unit, Clinica Universitaria de Navarra, Pamplona, Spain
20. Department of Gastroenterology, Hôpital Edouard Herriot, Lyon, France
21. Department of Gastroenterology, Hospital Universitario de Canarias, Tenerife, Spain
22. Gastroenterology Unit, Ospedale Valduce, Como, Italy
23. Division of Gastroenterology, Curto Hospital, Polla, Italy
24. Department of Medicine and Therapeutics, Division of Gastroenterology, Prince of Wales Hospital, Shatin, N.T., Hong Kong
25. Division of Gastroenterology and Hepatology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
26. Endoscopy Unit, Skane University Hospital, Lund University, Malmö, Sweden
27. Hepatogastroenterology Unit, 2nd Department of Internal Medicine-Propaedeutic, Attikon University General Hospital, Athens University, Athens, Greece