Universidad de Barcelona - Hospital Clínic Barcelona, Universidad de Barcelona - Hospital Clínic Barcelona, Universidad de Barcelona - Hospital Clínic Barcelona, Hospital Universitario de Canarias, Hospital Universitario de Canarias, Universidad de Barcelona - Hospital Clínic Barcelona, Universidad de Barcelona - Hospital Clínic Barcelona, University of Bonn - University Hospital Bonn (UKB), University of Bologna, University of Bonn - University Hospital Bonn (UKB), University of Bonn - Department of Internal Medicine I, KU Leuven - Department of Gastroenterology and Hepatology, KU Leuven - Molecular Digestive Oncology, Osakidetza Basque Health Service - Galdakao-Usansolo University Hospital, Universitat Pompeu Fabra (UPF) - Hospital del Mar Medical Research Institute, Universitat Pompeu Fabra (UPF) - Hospital del Mar Medical Research Institute, Hospital Universitario de Móstoles, Humanitas University, Humanitas University - Department of Biomedical Sciences, Alvaro Cunqueiro University Hospital, Università Vita-Salute San Raffaele - Gastroenterology and Gastrointestinal Endoscopy Unit, Hospital de la Santa Creu i Sant Pau, Hospital de la Santa Creu i Sant Pau, Universitat de Vic - Universitat Central de Catalunya (UVic-UCC), Universidad Pública de Navarra - IdiSNA, Navarra Institute for Health Research, Universidad Pública de Navarra - IdiSNA, Navarra Institute for Health Research, Universidad de Barcelona - Hospital Clínic Barcelona, Ourense University Hospital, University Miguel Hernández, Universidad de Barcelona - Hospital Clínic Barcelona, Universidad de Barcelona - Hospital Clínic Barcelona and Independent