RT Journal Article SR Electronic T1 Authors' response JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 139 OP 139 DO 10.1136/gut.2010.221986 VO 60 IS 1 A1 Marian Knight A1 Catherine Nelson-Piercy A1 Jennifer J Kurinczuk A1 Patsy Spark A1 Peter Brocklehurst YR 2011 UL http://gut.bmj.com/content/60/1/139.1.abstract AB