1. Division of Surgery and Interventional Science, University College London, London, United Kingdom
2. Nottingham University Hospitals, Nottingham, United Kingdom
3. Washington University School of Medicine in St. Louis, St. Louis, Missouri, United States
4. Statsconsultancy Ltd., Amersham, United Kingdom
5. Department of Gastroenterology, Klinikum Osnabruck, Osnabruck, Germany
6. Department of Gastroenterology, Kings College Hospital, London, United Kingdom
7. Department of Gastroenterology, The Royal Free Hospital, London, United Kingdom
8. Department of Gastroenterology, Bradford Teaching Hospitals Foundation Trust, Bradford, United Kingdom
9. Department of Gastroenterology, University Hospital Southampton, Southampton, United Kingdom
10. Department of Gastroenterology, Guy’s and St Thomas’ Foundation Trust Hospitals, London, United Kingdom
11. Department of Gastroenterology, Belfast Health and Social Care Trust, Belfast, United Kingdom
12. Department of Gastroenterology, University College London Hospital, London, United Kingdom
13. Department of Gastroenterology, Gloucestershire Hospitals NHS Foundation trust, Cheltenham, United Kingdom
14. Department of Gastroenterology, Portsmouth Hospitals NHS Trust, Portsmouth, United Kingdom
15. Department of Gastroenterology, Tübingen University Hospital, Tübingen, Germany
16. Horst Schmidt Kliniken, Wiesbaden, Germany
17. Department of Gastroenterology, Centre Hospitalier Universitaire, Nantes, France