PT - JOURNAL ARTICLE ED - , TI - ANSWER AID - 10.1136/gut.2007.122580a DP - 2008 Jun 01 TA - Gut PG - 779--779 VI - 57 IP - 6 4099 - http://gut.bmj.com/content/57/6/779.short 4100 - http://gut.bmj.com/content/57/6/779.full SO - Gut2008 Jun 01; 57