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Syväoja, H. J., Kankaanpää, A., Kallio, J., Hakonen, H., Kulmala, J., Hillman, C. H., Pesonen, A., & Tammelin, T. H. (n.d. ). The Relation of Physical Activity, Sedentary Behaviors, and Academic Achievement Is Mediated by Fitness and Bedtime, Journal of Physical Activity and Health, 15(2), 135-143. Retrieved Nov 12, 2019, from