1. Endoscopy and Gastroenterology Unit, Department of gastroenterology, CHU Amiens Picardie, Amiens, France
2. Endoscopy and Gastroenterology Unit, Pontchaillou University Hospital, Rennes, France
3. Department of Endoscopy and Gastroenterology, Dupuytren University Hospital, Limoges, France
4. Department of Gastroenterology, Hepatopancreatology and Digestive Oncology, Erasme University Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
5. Endoscopy and Gastroenterology Unit, Hôpital Edouard Herriot, Hospices Civils de Lyon, Lyon, France
6. Laboratoire de Biométrie et Biologie Évolutive UMR 5558, Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Villeurbanne, France
7. Department of Endoscopy and Gastroenterology, Centre Hospitalier Universitaire de Nancy – Hôpitaux de Brabois, Nancy, France