TY - JOUR T1 - FRIDAY 26TH MARCH JF - Gut JO - Gut SP - S50 LP - S73 DO - 10.1136/gut.34.1_Suppl.S50 VL - 34 IS - 1 Suppl A2 - , Y1 - 1993/01/01 UR - http://gut.bmj.com/content/34/1_Suppl/S50.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -