title: Reply to Dr. Yamamoto et al.'s letter.
authors.forename: Maria
authors.initials: M
authors.lastname: O'Sullivan
authors.forename: Tara
authors.initials: T
authors.lastname: Raftery
authors.forename: Treasa
authors.initials: T
authors.lastname: Nic Suibhne
mesh_terms: D003424:Crohn Disease / Q000453:epidemiology*; D006801:Humans; D009765:Obesity / Q000453:epidemiology*; D050177:Overweight / Q000453:epidemiology*