1. Service of Gastroenterology and Hepatology, Geneva University Hospitals, Geneva, Switzerland
2. Department of Gastroenterology and Hepatology, Medical Centre for Postgraduate Education and Department of Gastroenterology, The M. Sklodowska-Curie Memorial Cancer Centre and Institute of Oncology, Warsaw, Poland
3. Digestive Endoscopy Unit, Catholic University, Rome, Italy
4. Department of Surgical Gastroenterology, Herlev Hospital and Gentofte Hospital, Copenhagen University, Denmark
5. Endoscopic Unit, Paoli-Calmettes Institut, Marseilles, France
6. Endoscopic Unit, Cannes Hospital, Cannes, France
7. Department of Gastroenterology, Hôpital Privé Jean Mermoz, Lyon, France
8. Endoscopy Unit, Department of Gastroenterology, ICMDM, IDIBAPS, CIBERehd, Hospital Clínic, Barcelona, Spain
9. Division of Gastroenterology, Hospital Ramon, University of Alcala, Cajal, Madrid, Spain