TY - JOUR T1 - Discussion JF - British Journal of Sports Medicine JO - Br J Sports Med SP - 67 LP - 67 DO - 10.1136/bjsm.15.1.67 VL - 15 IS - 1 A2 - , Y1 - 1981/03/01 UR - http://bjsm.bmj.com/content/15/1/67.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -