1. Department of Gastroenterology and Endoscopy; Rene Descartes University; France
2. Unit of Epidemiology and Clinical Research INSERM; Centre d'Investigation Épidémiologique 4, F, Georges Pompidou European Hospital; Rene Descartes University; France
3. Department of Gastroenterology and Endoscopy; Edouard Herriot Hospital; Lyon France
4. Department of Gastroenterology and Endoscopy; Saint Phillibert Hospital; Lille France
5. Department of Gastroenterology and Endoscopy; Nouvel Hôpital Civil; Strasbourg France
6. Department of Gastroenterology and Endoscopy; Lariboisière Hospital; Assistance Publique-Hôpitaux de Paris; Paris France