RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 793 OP 793 DO 10.1136/gut.38.5.793-a VO 38 IS 5 A1 F Parente A1 G Maconi A1 G Bianchi Porro YR 1996 UL http://gut.bmj.com/content/38/5/793.2.abstract AB