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APA Citation
Desmet, C., Sutherland, R., Davies, L., Wolfenden, L., Butler, P., McCarthy, N., Cohen, J., & Nathan, N. (n.d.). objectively measuring children's physical activity levels in a free living environment. Journal of science and medicine in sport, 20, e104–. http://access.bl.uk/ark:/81055/vdc_100041918480.0x00001e