Ulcerative proctocolitis in Czechoslovakia.
D000328:Adult; D000368:Aged; D003093:Colitis, Ulcerative / Q000453:epidemiology*; D003604:Czechoslovakia; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009520:New Zealand; D009664:Norway; D014481:United States