1. Department of Gastroenterology, Public Assistance Hospitals of Marseille, North Hospital, Marseille, France
2. Department of Endoscopy, University Hospital of Nice, Nice, France
3. Aix-Marseille University, CERC, Faculty of Medicine, Marseille, France
4. Department of Digestive Surgery, Public Assistance Hospitals of Marseille, Marseille, France
5. Department of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States