2 Department of Gastroenterology, St Richard's and Worthing Hospitals, University Hospitals Sussex National Health Service Foundation Trust, West Sussex, United Kingdom; Translational Gastroenterology Unit, Nuffield Department of Experimental Medicine, University of Oxford, Oxford, United Kingdom.
3 Translational Gastroenterology Unit, Nuffield Department of Experimental Medicine, University of Oxford, Oxford, United Kingdom.
4 Gastroenterology Division, Surgical Department, Hospital Beatriz Ângelo, Loures, Portugal; Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal; Division of Gastroenterology, Hospital da Luz, Lisbon, Portugal.