PT - JOURNAL ARTICLE AU - P J Allan AU - S Appleton AU - A S McIntyre TI - A shadow of doubt AID - 10.1136/gut.2008.167767 DP - 2009 May 01 TA - Gut PG - 617--617 VI - 58 IP - 5 4099 - http://gut.bmj.com/content/58/5/617.short 4100 - http://gut.bmj.com/content/58/5/617.full SO - Gut2009 May 01; 58