PT - JOURNAL ARTICLE ED - , TI - Retraction AID - 10.1136/bjsports-2014-094053ret DP - 2019 Apr 01 TA - British Journal of Sports Medicine PG - e4--e4 VI - 53 IP - 8 4099 - http://bjsm.bmj.com/content/53/8/e4.short 4100 - http://bjsm.bmj.com/content/53/8/e4.full SO - Br J Sports Med2019 Apr 01; 53