1. Gastroenterology and Endoscopy Unit, Pavillon L, Edouard Herriot Hospital, Lyon, France
2. Inserm U1032, Labtau, Lyon, France
3. Gastroenterology and Endoscopy Unit, Dupuytren University Hospital, Limoges, France
4. Department of Gastroenterology, Pontchaillou University Hospital, Rennes, France