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APA Citation
Mattocks, C., Deere, K., Leary, S., Ness, A., Tilling, K., Blair, S. N., & Riddoch, C. (2008). early life determinants of physical activity in 11 to 12 year olds: cohort study. British journal of sports medicine, 42(9), 721–724. http://access.bl.uk/ark:/81055/vdc_100135560903.0x000017