RT Journal Article SR Electronic T1 Surgery of the Anus, Rectum, and Colon JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 598 OP 598 DO 10.1136/gut.49.4.598a VO 49 IS 4 A1 MORTENSEN, N YR 2001 UL http://gut.bmj.com/content/49/4/598.2.abstract AB