1. Department of Endoscopy and Gastroenterology, Centre Hospitalier Universitaire Pontchaillou, Rennes, France
2. Department of Hepatogastroenterology, Centre Hospitalier Universitaire Dupuytren, Limoges, France
3. Department of Gastroenterology, Hôpital Edouard Herriot, Hospices Civils de Lyon, Lyon, France