PT - JOURNAL ARTICLE ED - , TI - WITHDRAWN AID - 10.1136/bjsports-2014-093494.301 DP - 2014 Apr 01 TA - British Journal of Sports Medicine PG - 672--672 VI - 48 IP - 7 4099 - http://bjsm.bmj.com/content/48/7/672.2.short 4100 - http://bjsm.bmj.com/content/48/7/672.2.full SO - Br J Sports Med2014 Apr 01; 48