RT Journal Article SR Electronic T1 Cancer in ulcerative colitis. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 425 OP 426 DO 10.1136/gut.7.5.425 VO 7 IS 5 A1 B C Morson YR 1966 UL http://gut.bmj.com/content/7/5/425.abstract AB