title: Is ileocaecal Crohn's disease L1 or L3 according to the Montreal classification?
authors.forename: Laurent
authors.initials: L
authors.lastname: Peyrin-Biroulet
mesh_terms: D003092:Colitis / Q000145:classification*; D003424:Crohn Disease / Q000145:classification*; D006801:Humans; D007079:Ileitis / Q000145:classification*; D015203:Reproducibility of Results