PT - JOURNAL ARTICLE ED - , TI - ANSWER AID - 10.1136/gut.2007.141853a DP - 2008 Aug 01 TA - Gut PG - 1089--1089 VI - 57 IP - 8 4099 - http://gut.bmj.com/content/57/8/1089.short 4100 - http://gut.bmj.com/content/57/8/1089.full SO - Gut2008 Aug 01; 57