Routine sigmoidoscopy in asymptomatic patients.
D000328:Adult; D000368:Aged; D000413:Alaska; D003110:Colonic Neoplasms / Q000175:diagnosis; D003362:Cost-Benefit Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009780:Occult Blood; D012004:Rectal Neoplasms / Q000175:diagnosis; D012812:Sigmoidoscopy / Q000191:economics