TY - JOUR T1 - Reply JF - Gut JO - Gut SP - 1191 LP - 1192 DO - 10.1136/gut.28.9.1191 VL - 28 IS - 9 AU - J Penston AU - K G Wormsley Y1 - 1987/09/01 UR - http://gut.bmj.com/content/28/9/1191.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -