RT Journal Article SR Electronic T1 Immunohistochemical Cal9-9 in primary colonic polyps and polyps synchronous with colorectal cancer JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1049 OP 1055 DO 10.1136/gut.28.8.1049 VO 28 IS 8 YR 1987 UL http://gut.bmj.com/content/28/8/1049.abstract AB