1. NIHR Nottingham Digestive Diseases Biomedical Research Unit; Nottingham University Hospitals NHS Trust and University of Nottingham; Nottingham UK
2. Gastroenterology and Endoscopy Unit; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico; Department of Pathophysiology and Transplantation; Università degli Studi di Milano; Milan Italy