1 Department of Gastroenterology and Hepatology, Amsterdam University Medical Centre, location Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands.
3 Department of Medicine, Facultat de Ciències de la Salut, Universitat de Vic-Universitat Central de Catalunya (UVic-UCC), Manresa, Spain.
4 Gastrointestinal Endoscopy Unit, Digestive Diseases Department, La Fe Polytechnic University Hospital, Valencia, Spain.
5 Gastrointestinal Endoscopy Research Group, La Fe Health Research Institute, Valencia, Spain.
6 Institut des Maladies de l'Appareil Digestif (IMAD), CHU Nantes, Université Nantes, Nantes, France.
7 Gastroenterology Department, County Hospital Mures, Targu Mures, Romania.
8 Endoscopy Department, Yaroslavl Regional Cancer Hospital, Yaroslavl, Russian Federation.
9 Department of Gastroenterology, Faculty of Additional Professional Education, Pirogov Russian National Research Medical University, Moscow, Russian Federation.
10 Department of Medicine I, University Medical Center Mainz, Mainz, Germany.
11 Department of Gastroenterology, University College London Hospitals, London, UK.
12 Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto, Portugal.
13 Center for Research in Health Technologies and Information Systems (CINTESIS), Faculty of Medicine, University of Porto, Porto, Portugal.
14 Surgery and Physiology Department, Faculty of Medicine of the University of Porto, Porto, Portugal.
15 Academic Unit of Gastroenterology, Royal Hallamshire Hospital, Sheffield, UK.
16 Department of Gastroenterology, Hepatopancreatology and Digestive Oncology, Erasme University Hospital, Brussels, Belgium.
17 Gastroenterology Division, Hôpital Edouard Herriot, Lyon, France.
18 Translational Gastroenterology Unit, Nuffield Department of Medicine, Experimental Medicine Division, John Radcliffe Hospital, University of Oxford, Oxford, UK.
19 Oxford National Institute for Health Research Biomedical Research Centre, University of Oxford, Oxford, UK.
20 Department of Gastroenterology and Hepatology, Catholic University of Leuven (KUL), TARGID, University Hospital Leuven, Leuven, Belgium.