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Elementary school physical activity opportunities and physical fitness of students: A statewide cross-sectional study of schools
- Patricia C. Cheung,
- Padra A. Franks,
- Michael R. Kramer,
- Christi M. Kay,
- Carolyn D. Drews-Botsch,
- Jean A. Welsh,
- Julie A. Gazmararian
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- Published: January 15, 2019
- https://doi.org/10.1371/journal.pone.0210444