Letter: Screening for colonic and rectal carcinoma.
D003110:Colonic Neoplasms / Q000000981:diagnostic imaging*; D003287:Contrast Media / Q000008:administration & dosage; D006801:Humans; D008722:Methods; D011859:Radiography; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging*
D003287:Contrast Media