RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 959 OP 960 DO 10.1136/gut.31.8.959-c VO 31 IS 8 A1 Riley, S A A1 Mani, V A1 Goodman, M J YR 1990 UL http://gut.bmj.com/content/31/8/959.4.abstract AB