RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 575 OP 575 DO 10.1136/gut.34.4.575-b VO 34 IS 4 A1 S Y Iftikhar A1 R J C Steele A1 S Watson A1 P D James YR 1993 UL http://gut.bmj.com/content/34/4/575.3.abstract AB