1. Department of Gastroenterology, Edouard Herriot Hospital, Hospices Civils de Lyon, Lyon, France
2. Endoscopy Unit, Ramsay Générale de Santé, Jean Mermoz Hospital, Lyon, France
3. Department of Medicine, University Claude Bernard Lyon 2, Lyon, France
4. Department of Digestive Surgery, Edouard Herriot Hospital, Hospices Civils de Lyon, Lyon, France
5. Department of Pathology, Jean Mermoz Hospital, Ramsay Générale de Santé, Lyon, France