Exercise and immune function

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Kusaka, Y., Kondou, H., & Morimoto, K. (1992). Healthy lifestyles are associated with higher natural killer cell activity. Prev Med, 21(5), 602-615. 

Mackinnon, L. T. (1989). Exercise and natural killer cells. What is the relationship? Sports Med, 7(3), 141-149. 

Trinh, S., & Palmer, E. (2017). Clinical Review: Depression and Exercise. Glendale, CA: Cinahl Information Systems.