Anoscopy vs. retroflexion for evaluation of the anal canal.
Thornton
Scott C
SC
Hirshorn
Steven A
SA
Bradway
Marcella
M
Levien
David
D
D003111:Colonic Polyps / Q000175:diagnosis*; D006801:Humans; D020694:Sigmoidoscopes; D012812:Sigmoidoscopy / Q000379:methods*