TY - JOUR T1 - Medicine and Social Science JF - Archives of Disease in Childhood JO - Arch Dis Child SP - 303 LP - 309 DO - 10.1136/adc.30.152.303 VL - 30 IS - 152 AU - F. A. E. Crewe Y1 - 1955/08/01 UR - http://adc.bmj.com/content/30/152/303.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -