Ano-rectal bleeding: a study of causes and investigative yields.
D001004:Anus Diseases / Q000209:etiology*; D005401:Fissure in Ano / Q000150:complications; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006484:Hemorrhoids / Q000150:complications; D006801:Humans; D012002:Rectal Diseases / Q000209:etiology*; D012189:Retrospective Studies