1. Endoscopy and Gastroenterology Unit, Edouard Herriot Hospital, Hospices Civils de Lyon, Lyon, France
2. Gastroenterology and Endoscopy Unit, Pontchaillou University Hospital, Rennes, France
3. Institute of Multi-Site Pathology of the HCL-Est Site, GHE University Hospital, Bron, France
4. Gastroenterology and Endoscopy Unit, Dupuytren University Hospital, Limoges, France