PT - JOURNAL ARTICLE ED - , TI - ANSWER AID - 10.1136/gut.2007.132605a DP - 2008 Aug 01 TA - Gut PG - 1081--1081 VI - 57 IP - 8 4099 - http://gut.bmj.com/content/57/8/1081.short 4100 - http://gut.bmj.com/content/57/8/1081.full SO - Gut2008 Aug 01; 57