1Department of Gastroenterology and Hepatology, University Hospital Leuven, Leuven, Belgium

2Department of Gastroenterology, University Hospital of North Tees, Stockton-on-Tees, UK

3Population Health Sciences Institute, Newcastle University, Newcastle, UK

4Gastroenterology Department, Portuguese Oncology Institute, Coimbra, Portugal

5Center for Health Technology and Services Research (CINTESIS), University of Porto, Porto, Portugal

6Università Cattolica del Sacro Cuore, Rome, Italy

7Digestive Endoscopy Unit and Gastroenterology, Fondazione Poliambulanza, Brescia, Italy

8Department of Medicine I, Josephs Hospital Warendorf, Warendorf, Germany

9Department of Gastroenterological Oncology and Department of Cancer Prevention, The Maria Sklodowska–Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland

10Department of Gastroenterology, Royal Wolverhampton NHS Trust, Wolverhampton, UK

11Hepato-gastroenterology Department, Mohammed VI University Hospital, Oujda, Morocco

12Digestive Diseases Research Laboratory (LARMAD), Mohammed First University, Oujda, Morocco

13Ellen and Pinchas Mamber Institute of Gastroenterology and Hepatology, Emek Medical Center, Afula, Israel

14Rappaport Family Faculty of Medicine, Technion Israel Institute of Technology, Haifa, Israel

15Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy

16Endoscopy Center, University Clinic of Augsburg, Augsburg, Germany

17Gastroenterology Division, Hôpital Edouard Herriot, Lyon, France

18Department of Gastroenterology and Hepatology, University of Amsterdam, Amsterdam, The Netherlands

19Department of Medicine I, Agaplesion Markus Hospita, Frankfurt, Germany

20Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto, Portugal

Raf Bisschops, Department of Gastroenterology and Hepatology, University Hospital Leuven, KU Leuven, Herestraat 49, 3000 Leuven, Belgium. Email: [email protected]