PT - JOURNAL ARTICLE AU - Maarten Moen TI - Commentary 1 on “Physical performance changes after unsupervised training during the autumn/spring semester break in competitive tennis players” AID - 10.1136/bjsm.2007.039990 DP - 2007 Nov 01 TA - British Journal of Sports Medicine PG - 710--710 VI - 41 IP - 11 4099 - http://bjsm.bmj.com/content/41/11/710.1.short 4100 - http://bjsm.bmj.com/content/41/11/710.1.full SO - Br J Sports Med2007 Nov 01; 41