RT Journal Article SR Electronic T1 Collagenous colitis. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1109 OP 1110 DO 10.1136/gut.27.9.1109 VO 27 IS 9 A1 Cooke, W T YR 1986 UL http://gut.bmj.com/content/27/9/1109.abstract AB