PT - JOURNAL ARTICLE AU - John Orchard TI - More research is needed into the effects on injury of substitute and interchange rules in team sports AID - 10.1136/bjsports-2011-090470 DP - 2012 Aug 01 TA - British Journal of Sports Medicine PG - 694--695 VI - 46 IP - 10 4099 - http://bjsm.bmj.com/content/46/10/694.short 4100 - http://bjsm.bmj.com/content/46/10/694.full SO - Br J Sports Med2012 Aug 01; 46