1. National Institute for Health Research; Nottingham Digestive Diseases Biomedical Research Centre; Nottingham University Hospitals NHS Trust; University of Nottingham; Nottingham UK
2. Division of Gastroenterology and Hepatology; Mayo Clinic; Rochester MN USA
3. GI Physiology Unit; University College London Hospital; London UK
4. Blizard Institute; Barts & the London School of Medicine and Dentistry; Queen Mary University of London; London UK
5. University Hospital of North Durham; Durham UK