Cardiorespiratory Fitness Levels Among U.S. Youth Aged 12-15 Years, United States, 1999-2004 and 2012Cardiorespiratory Fitness Levels Among U.S. Youth Aged 12-15 Years, United States, 1999-2004 and 2012
Hyattsville, MD : U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics, 2014.
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