The American Medical Society for Sports Medicine released a position statement that estimated as many as 3.8 million concussions occur within sports per year and up to 50% of concussions may go unreported.Harmon K. G., Drezner J. A, Gammons M, Guskiewicz, K.M., Halstead, M., Herring, S.A., Kutcher, J.S., Pana, A., Putukian, M., & Roberts, W. O. (2012). American Medical Society for Sports Medicine position statement: concussion in sport. British Journal of Sports Medicine, 47, 15–26.
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