1. Translational Gastroenterology Unit, John Radcliffe Hospital, Oxford, United Kingdom
2. Department of Gastroenterology and Hepatology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands.
3. Gastroenterology Department, University Hospital Leuven, Leuven, Belgium
4. Solent Centre for Digestive Diseases, Queen Alexandra Hospital, Portsmouth, United Kingdom
5. Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy
6. Centre for Colorectal Disease, St. Vincent's University Hospital, Elm Park, Dublin, Ireland
7. Klinik für Innere Medizin II, Dr Horst Schmidt Kliniken GmbH, Wiesbaden, Germany.
8. Wolfson Unit for Endoscopy, St. Mark’s Hospital, London, United Kingdom
9. Gedyt Endoscopy Center, Buenos Aires, Argentina