School sport policy and school-based physical activity environments and their association with observed physical activity in middle school children
Jason N. Bocarro, Michael A. Kanters, Ester Cerin, Myron F. Floyd, Jonathan M. Casper, Luis J. Suau, Thomas L. McKenzieVolume:
18
Year:
2012
Language:
english
Pages:
8
DOI:
10.1016/j.healthplace.2011.08.007
File:
PDF, 166 KB
english, 2012