RT Journal Article SR Electronic T1 Adenomatous polyps of the colon: pathobiological and clinical features JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 459 OP 459 DO 10.1136/gut.32.4.459-a VO 32 IS 4 A1 Williams, C B YR 1991 UL http://gut.bmj.com/content/32/4/459.2.abstract AB