Perianal lesions in Crohn's disease.
D000038:Abscess / Q000453:epidemiology; D001004:Anus Diseases / Q000150:complications / Q000453:epidemiology*; D003424:Crohn Disease / Q000150:complications*; D005401:Fissure in Ano / Q000453:epidemiology; D006484:Hemorrhoids / Q000453:epidemiology; D006801:Humans; D012606:Scotland