Some aspects of the epidemiology of ulcerative colitis.
D003093:Colitis, Ulcerative / Q000453:epidemiology* / Q000209:etiology / Q000235:genetics; D003424:Crohn Disease / Q000453:epidemiology; D004641:Emigration and Immigration; D006801:Humans; D007585:Jews; D012423:Rural Health; D014504:Urban Health