TY - JOUR T1 - Abstracts JF - Gut JO - Gut SP - A241 LP - A257 DO - 10.1136/gut.37.Suppl_2_Pt_2.A241 VL - 37 IS - Suppl 2 Pt 2 A2 - , Y1 - 1995/01/01 UR - http://gut.bmj.com/content/37/Suppl_2_Pt_2/A241.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -