(Q48738974)
Statements
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Physical activity levels and prompts in young children at recess: a two-year study of a bi-ethnic sample. (English)
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Sallis JF
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McKenzie TL
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Elder JP
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Berry CC
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Hoy PL
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Nader PR
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Zive MM
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Broyles SL
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1 September 1997
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68
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3
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195-202
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