RT Journal Article SR Electronic T1 Virtual colonoscopy detected colorectal polyps in asymptomatic patients with average risk of colorectal neoplasia JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 123 OP 123 DO 10.1136/ebm.9.4.123 VO 9 IS 4 YR 2004 UL http://ebm.bmj.com/content/9/4/123.abstract AB