RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1799 OP 1800 DO 10.1136/gut.30.12.1799 VO 30 IS 12 A1 Sonnenberg, Amnon YR 1989 UL http://gut.bmj.com/content/30/12/1799.abstract AB