title: Changing patterns in epidemiology of Crohn's disease.
mesh_terms: D003093:Colitis, Ulcerative / Q000175:diagnosis / Q000453:epidemiology; D003424:Crohn Disease / Q000175:diagnosis / Q000453:epidemiology*; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D012744:Sex Ratio; D013548:Sweden; D014505:Urban Population; D014852:Wales