RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 873 OP 874 DO 10.1136/gut.29.6.873-a VO 29 IS 6 A1 Murray, W R YR 1988 UL http://gut.bmj.com/content/29/6/873.2.abstract AB