Sigmoidoscopy in the asymptomatic "over 40's".
D003110:Colonic Neoplasms; D004194:Disease; D006801:Humans; D008875:Middle Aged; D011127:Polyps / Q000175:diagnosis*; D012004:Rectal Neoplasms; D012007:Rectum; D012812:Sigmoidoscopy
COLON/neoplasms; MIDDLE-AGE/diseases; POLYPI/diagnosis; RECTUM/neoplasms; SIGMOIDOSCOPY