1. Digestive Endoscopy Unit, Catholic University, Rome, Italy
2. Department of Health Economy and Health Management, University of Oslo and Department of Transplantation Medicine, Gastroenterology Unit, Oslo University Hospital, Oslo, Norway
3. Department of Gastroenterology and Hepatology, Medical Centre for Postgraduate Education, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
4. Centre for Digestive Diseases, The General Infirmary, Leeds, UK
5. Wolfson Unit for Endoscopy, St Mark's Hospital, Imperial College London, UK
6. Department of Gastroenterology, Avicenne Hospital, Paris, France
7. Department of Gastroenterology, Sorlandet Hospital Kristiansand, Norway
8. Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
9. Division of Gastroenterology, L. Curto Hospital, Polla, Sant'Arsenio, Italy
10. Gastroenterology Unit, New Mowasat Hospital, Salmiya, Kuwait
11. Digestive Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy
12. Service of Gastroenterology and Hepatology, Geneva University Hospitals, Geneva, Switzerland