TY - JOUR AU - Beets, M W; Beighle, A; Erwin, H E; Huberty, J L TI - After-school program impact on physical activity and fitness: a meta-analysis JO - Am J Prev Med VL - 36 PY - 2009 DO - 10.1016/j.amepre.2009.01.033 SP - 527 EP - 537 ER -