University of Amsterdam - Department of Gastroenterology and Hepatology, affiliation not provided to SSRN, University College London Hospital - Department of Gastroenterology, Medizinische Klinik - Klinikum Augsburg, III, affiliation not provided to SSRN, affiliation not provided to SSRN, Queen Alexandra Hospital, Humanitas University - Department of Biomedical Sciences, affiliation not provided to SSRN, Hirslanden Private Hospital Group - Centre of Gastroenterology, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Catharina Hospital - Department of Gastroenterology and Hepatology, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Radboud University Nijmegen - Radboud University Medical Center, AOU Città della Salute e della Scienza di Torino - SSD Epidemiologia e Screening, affiliation not provided to SSRN, UZ Leuven, University of Amsterdam - Department of Gastroenterology and Hepatology, IRCCS Humanitas Research Hospital - Department of Biomedical Sciences and KU Leuven - Department of Gastroenterology and Hepatology

University of Bologna - Department of Medical and Surgical Sciences, University College London Hospital - Department of Gastroenterology, University of Bologna - Department of Medical and Surgical Sciences, University College London Hospital - Department of Gastroenterology, University of Bologna - Gastroenterology and Endoscopy Unit, University of Bologna - Gastroenterology and Endoscopy Unit and University of Leeds - Leeds Institute of Medical Research at St. James’s