TY - JOUR T1 - Abstract JF - Research Newsletter JO - Res Newsl SP - 139 LP - 139 VL - os-4 IS - 12 A2 - , Y1 - 1956/08/01 UR - http://bjgp.org/content/os-4/12/139.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -