1. Department of Endoscopy and Hepato-Gastroenterology, Pavillon L, Edouard Herriot Hospital, Lyon, France
2. Department of Endoscopy and Hepato-Gastroenterology, Pontchaillou University Hospital, Rennes, France
3. Department of Endoscopy and Hepato-Gastroenterology, Nord West Hospital, Villefranche-sur-Saône, France