PT - JOURNAL ARTICLE ED - , TI - ANSWER AID - 10.1136/gut.2007.147967a DP - 2008 Sep 01 TA - Gut PG - 1314--1314 VI - 57 IP - 9 4099 - http://gut.bmj.com/content/57/9/1314.short 4100 - http://gut.bmj.com/content/57/9/1314.full SO - Gut2008 Sep 01; 57