An epidemiological investigation of hemorrhoids.
D000328:Adult; D000368:Aged; D003248:Constipation; D003710:Demography; D004032:Diet; D005260:Female; D006484:Hemorrhoids / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D011248:Pregnancy Complications; D012959:Socioeconomic Factors