RT Journal Article SR Electronic T1 Clinics in gastroenterology 14:2 JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 558 OP 558 DO 10.1136/gut.29.4.558-a VO 29 IS 4 A1 W R Lees YR 1988 UL http://gut.bmj.com/content/29/4/558.2.abstract AB