Differences in elementary-age children's accelerometer - measured physical activity between school and summer: three-year findings from the What's UP (Undermining Prevention) with... by Michael W. Beets, Sarah Burkart, Christopher Pfledderer, Elizabeth Adams, R. Glenn Weaver, Bridget Armstrong, Keith Brazendale, Xuanxuan Zhu, Alexander McLain, Brie Turner-McGrievy, Russell Pate, Andrew Kaczynski, Amanda Fairchild, Brian Saelens, Hannah Parker

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