1. Gastroenterology and Hepatology Unit, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
2. Department of Endoscopy and Hepato-Gastroenterology, Pavillon L, Edouard Herriot Hospital, Lyon, France
3. Gastroenterology and Endoscopy Unit, Dupuytren University Hospital, Limoges, France
4. Department of Gastroenterology, University Hospital of Rennes, Pontchaillou, Rennes, France