RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1294 OP 1294 DO 10.1136/gut.33.9.1294 VO 33 IS 9 A1 K M Carlisle A1 M Halliwell A1 P N T Wells A1 A E Read YR 1992 UL http://gut.bmj.com/content/33/9/1294.1.abstract AB