1. Gastroenterology and Endoscopy Unit Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico Milano Italy
2. NIHR Nottingham Biomedical Research Centre (BRC) Nottingham University Hospitals NHS Trust and the University of Nottingham Nottingham UK
3. Nottingham Digestive Diseases Centre School of Medicine University of Nottingham Nottingham UK