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