1 Translational Gastroenterology Unit, Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, OX3 9DU, UK; Faculty of Medicine, Imperial College London, London, UK.
2 Translational Gastroenterology Unit, Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, OX3 9DU, UK; Translational Research for Gastrointestinal Diseases, University Hospitals Leuven, Herestraat 49, 3000 Leuven, Belgium. Electronic address: Judith.wellens@kuleuven.be.
3 Translational Gastroenterology Unit, Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, OX3 9DU, UK.