1. Department Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, Netherlands
2. Department of Gastroenterology, Municipal Hospital, Gera, Germany
3. Endoscopy Unit, Hospital Costa del Sol, Marbella, Spain
4. Department of Internal Medicine II, Department of Gastroenterology, Städt. Klinikum Karlsruhe, Karlsruhe, Germany
5. Department of Internal Medicine I, University Hospital Dresden, TU Dresden, Dresden, Germany
6. Department of Internal Medicine and Gastroenterology, Medical Center Städte Region Aachen, Würselen, Germany
7. Department of Endoscopy, Hospital Clinico San Carlos, Madrid, Spain
8. Department of Gastroenterology, Klinikum Augsburg, Augsburg, Germany
9. Department of Surgery, Copenhagen University Hospital Herlev, Copenhagen, Denmark
10. Department of Endoscopy, Hospital Universitari de Bellvitge-IDIBELL, Barcelona, Spain
11. Department of Internal Medicine I, Asklepios Klinik Altona, Hamburg, Germany
12. Department of Interventional Endoscopy, Klinikum Dortmund, University Münster, Dortmund, Germany
13. Department of Gastroenterology, IDIPHIM, Puerta de Hierro University Hospital, Autónoma University, Madrid, Spain
14. Department of Digestive Disease, Hospital Parc Tauli, Barcelona, Spain
15. Endoscopy Unit, Clinica Girona, Girona, Spain