title: Endoscopy: insertion versus withdrawal phases for polyp detection.
authors: Indiana University Medical Center, Indianapolis, IN, USA. drex@iupui.edu
authors: Douglas K
authors: DK
authors: Rex
mesh_terms: D003111:Colonic Polyps / Q000473:pathology*; D016099:Endoscopy, Gastrointestinal / Q000379:methods*; D006801:Humans