1. Department of Gastroenterology, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust , Cambridge , UK
2. Department of Surgery and Department of Biomedical and Clinical Sciences, Linköping University , Linköping , Sweden
3. Translational Gastroenterology and Liver Unit, University of Oxford , Oxford , UK
4. Department of Surgery, Cantonal Hospital of Fribourg and Faculty of Science and Medicine, University of Fribourg , Fribourg , Switzerland
5. Faculty of Medicine, University of Basel , Basel , Switzerland