1. Gastroenterology and Endoscopy Unit, Cornouailles Hospital, Quimper, France
2. Gastroenterology and Endoscopy Unit, Dupuytren University Hospital, Limoges, France
3. Department of Endoscopy and Gastroenterology, Pontchaillou University Hospital, Rennes, France
4. Gastroenterology and Endoscopy Unit, Edouard Herriot Hospital, Hospices Civils de Lyon, Lyon, France