1. Department of Gastroenterology and Hepatology, University Hospital Leuven, Leuven, Belgium
2. Department of Gastroenterology, University Hospital of North Tees, Stockton-on-Tees, Cleveland, UK
3. Population Health Sciences Institute, Faculty of Medical Sciences, Newcastle University, UK
4. Gastroenterology Department, Portuguese Oncology Institute, Coimbra, Portugal
5. Center for Health Technology and Services Research (CINTESIS), Faculty of Medicine, University of Porto, Portugal
6. Università Cattolica del Sacro Cuore, Rome, Italy
7. Digestive Endoscopy Unit and Gastroenterology, Fondazione Poliambulanza, Brescia, Italy
8. Department of Medicine I, Josephs-Hospital Warendorf, Academic Teaching Hospital, University of Muenster, Warendorf, Germany
9. Department of Gastroenterological Oncology and Department of Cancer Prevention, The Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
10. Department of Gastroenterology, Royal Wolverhampton NHS Trust, UK
11. Hepato-gastroenterology department. Mohammed VI University Hospital, Oujda, Morocco
12. Digestive Diseases Research Laboratory (LARMAD), Medical School, Mohammed First University, Oujda, Morocco
13. Ellen and Pinchas Mamber Institute of Gastroenterology and Hepatology, Emek Medical Center, Afula, Israel
14. Rappaport Family Faculty of Medicine, Technion Israel Institute of Technology, Haifa, Israel
15. Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy
16. Endoscopy Center of the University Clinic of Augsburg, Augsburg, Germany
17. Gastroenterology Division, Hôpital Edouard Herriot, Lyon, France
18. Department of Gastroenterology & Hepatology, Amsterdam Gastroenterology & Metabolism, Amsterdam University Medical Centers, University of Amsterdam, The Netherlands
19. Department of Medicine I, Agaplesion Markus Hospital, Goethe University, Frankfurt/Main, Germany
20. Gastroenterology Department, Portuguese Oncology Institute of Porto, Portugal