RT Journal Article SR Electronic T1 Authors’ response JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 609 OP 610 VO 58 IS 4 A1 E Morris A1 P Quirke A1 J D Thomas A1 L Fairley A1 B Cottier A1 D Forman YR 2009 UL http://gut.bmj.com/content/58/4/609.abstract AB