1. Department of Epidemiology of Health Products; French National Agency for Medicines and Health Products Safety; Saint-Denis France
2. UMR-S 1136; INSERM & UPMC Univ Paris 06; Paris France
3. Université Paris-Sud; Assistance Publique-Hôpitaux de Paris and Gastroenterology Unit; Hôpitaux Universitaires Paris Sud; Le Kremlin Bicêtre France