TY - JOUR T1 - The British Society of Gastroenterology JF - Gut JO - Gut SP - 836 LP - 857 DO - 10.1136/gut.13.10.836 VL - 13 IS - 10 A2 - , Y1 - 1972/10/01 UR - http://gut.bmj.com/content/13/10/836.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -