TY - JOUR T1 - Annual of gastrointestinal endoscopy JF - Gut JO - Gut SP - 1337 LP - 1338 DO - 10.1136/gut.31.11.1337-c VL - 31 IS - 11 AU - D G Colin-Jones Y1 - 1990/11/01 UR - http://gut.bmj.com/content/31/11/1337.4.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -