PT - JOURNAL ARTICLE ED - , TI - Upper GI/basic AID - 10.1136/gut.35.4_Suppl.A28 DP - 1994 Jan 01 TA - Gut PG - A28--A29 VI - 35 IP - 4 Suppl 4099 - http://gut.bmj.com/content/35/4_Suppl/A28.short 4100 - http://gut.bmj.com/content/35/4_Suppl/A28.full SO - Gut1994 Jan 01; 35