Struwig G, Papaikonomou M, Kruger P. Effects of life event stress, exercise workload, hardiness and coping style on susceptibility to the common cold. Af. J. Phys Activity and Health Sci. [Internet]. 2007 Nov. 22 [cited 2026 Oct. 9];12(4):369-83. Available from: https://www.ajol.info/index.php/ajpherd/article/view/24761