RT Journal Article SR Electronic T1 Correction JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 636 OP 636 DO 10.1136/gutjnl-2011-300779corr1 VO 61 IS 4 YR 2012 UL http://gut.bmj.com/content/61/4/636.abstract AB