RT Journal Article SR Electronic T1 Large Bowel Cancer JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 552 OP 552 DO 10.1136/gut.23.6.552-a VO 23 IS 6 A1 J G Payne YR 1982 UL http://gut.bmj.com/content/23/6/552.2.abstract AB