title: Reply.
authors.affiliation: CHU de Bicêtre, Service de Gastroentérologie, APHP-Université Paris Sud, Le Kremlin Bicêtre, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Carbonnel
authors.affiliation: CHU de Bordeaux, Hôpital Haut-Lévêque, Service d'Hépato-Gastroentérologie Université Bordeaux, Laboratoire de Bactériologie Bordeaux, France.
authors.forename: David
authors.initials: D
authors.lastname: Laharie
authors.affiliation: Helmsley Inflammatory Bowel Disease Center, Icahn Medical School of Medicine at Mount Sinai, New York, New York.
authors.forename: Jean Frédéric
authors.initials: JF
authors.lastname: Colombel