RT Journal Article SR Electronic T1 Digest JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1 OP 2 DO 10.1136/gut.2010.235465 VO 60 IS 2 A1 Emad El-Omar A1 Severine Vermeire A1 Alexander Gerbes YR 2011 UL http://gut.bmj.com/content/60/2/1.abstract AB