RT Journal Article SR Electronic T1 Cluster’s last stand JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 773 OP 774 VO 53 IS 5 A1 S C Howell A1 G D Eslick A1 N J Talley YR 2004 UL http://gut.bmj.com/content/53/5/773.2.abstract AB