RT Journal Article SR Electronic T1 Reply JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 424 OP 424 DO 10.1136/gut.33.3.424-a VO 33 IS 3 A1 Burman, P A1 Mårdh, S A1 Lööf, L A1 Naesdal, J A1 Karlsson, F A YR 1992 UL http://gut.bmj.com/content/33/3/424.2.abstract AB