TY - JOUR T1 - Case reports. JF - British Journal of Sports Medicine JO - Br J Sports Med SP - 233 LP - 233 DO - 10.1136/bjsm.14.4.233 VL - 14 IS - 4 AU - J. D. Norval Y1 - 1980/12/01 UR - http://bjsm.bmj.com/content/14/4/233.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -