1 *Department of Gastroenterology, Saint Antoine Hospital, Assistance Publique Hôpitaux de Paris and Paris VI University, Paris, France †AVENIR Team, Gut Microbiota and Immunity, INSERM U1057/UMR CNRS 7203, Université Pierre et Marie Curie 6, Paris, France ‡Commensal and Probiotics-Host Interactions Laboratory, UMR 1319 Micalis, Jouy-en-Josas, France.