PT - JOURNAL ARTICLE ED - , TI - Online original articles DP - 2005 May 01 TA - British Journal of Sports Medicine PG - 253--253 VI - 39 IP - 5 4099 - http://bjsm.bmj.com/content/39/5/253.short 4100 - http://bjsm.bmj.com/content/39/5/253.full SO - Br J Sports Med2005 May 01; 39