1. Centre for Digestive Diseases, Department of Gastroenterology, The General Infirmary at Leeds, Leeds, United Kingdom
2. Digestive Endoscopy Unit, Catholic University, Rome, Italy
3. Stiftung Lebensblicke, Klinikum Ludwigshafen, Ludwigshafen, Germany
4. Department of Gastroenterology, Kettering General Hospital, Kettering, United Kingdom
5. Department of Gastroenterology, University Hospital of North Tees, Stockton-on-Tees, United Kingdom
6. Durham University, County Durham, UK
7. Department of Gastroenterology, HUG, Geneva, Switzerland
8. Department of Internal Medicine, Digestive Diseases and Endoscopy, New Mowasat Hospital, Salmiya, Kuwait
9. Department of Hepatogastroenterology, Edouard Herriot Hospital, Lyon, France