1. Gastroenterology and Endoscopy Unit, Dupuytren University Hospital, Limoges, France
2. Department of Gastroenterology, Humanitas Research Hospital, Milan, Italy
3. Gastroenterology and Endoscopy Unit, Edouard Herriot Hospital, Lyon, France
4. Endoscopy and Gastroenterology Unit, Pontchaillou University Hospital, Rennes, France