2 Department of Gastroenterology, Western Sussex Hospitals NHS Foundation Trust, West Sussex, and; Translational Gastroenterology Unit, Nuffield Department of Experimental Medicine, University of Oxford, Oxford, UK.
3 Translational Gastroenterology Unit, Nuffield Department of Experimental Medicine, University of Oxford, Oxford, UK.
4 Surgical Department, Gastroenterology Division, Hospital Beatriz Ângelo, Loures, and; Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal.