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Children's physical activity levels during school recess: a quasi-experimental intervention study.
Ridgers ND, Stratton G, Fairclough SJ, Twisk JW
Int J Behav Nutr Phys Act 2007, 4:19
[Full text] [PubMed] [Related articles] [Cited on BioMed Central]

Java Exception error '80004005'

java.lang.NullPointerException

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