An epidermilogical survey of Crohn's disease in Northern Ireland.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D003424:Crohn Disease / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007420:Intestine, Large; D007421:Intestine, Small; D008297:Male; D008875:Middle Aged; D009660:Northern Ireland