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Tremblay, M. S., Gray, C. E., Akinroye, K., Harrington, D. M., Katzmarzyk, P. T., Lambert, E. V., Liukkonen, J., Maddison, R., Ocansey, R. T., Onywera, V. O., Prista, A., Reilly, J. J., Martínez, M., Duenas, O., Standage, M., & Tomkinson, G. (2014). Physical Activity of Children: A Global Matrix of Grades Comparing 15 Countries, Journal of Physical Activity and Health, 11(s1), S113-S125. Retrieved Dec 14, 2019, from