title: Crohn's disease in Northern Ireland--a retrospective survey of 159 cases.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003424:Crohn Disease / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009660:Northern Ireland; D012189:Retrospective Studies