1. Service of Gastroenterology and Hepatology, Geneva University Hospitals, Geneva, Switzerland
2. Digestive Endoscopy Unit, Catholic University, Rome, Italy
3. Department of Gastroenterology and Hepato-Pancreatology, Erasme University Hospital, Brussels, Belgium
4. Department of Hepato-Gastroenterology. La Timone Hospital Marseilles France
5. Digestive and Bronchial Endoscopy Unit, Cannes Hospital, Cannes, France