Environmental supportiveness for physical activity in English schoolchildren: a study using Global Positioning Systems

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Andrew P Jones, Emma G Coombes, Simon J Griffin and Esther MF van Sluijs^*

* Corresponding author: Esther MF van Sluijs esther.vansluijs@mrc-epid.cam.ac.uk

International Journal of Behavioral Nutrition and Physical Activity 2009, 6:42 doi:10.1186/1479-5868-6-42