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Aubry MCantu RDvorak JGraf-Baumann TJohnston KKelly J: Summary and agreement statement of the First International Conference on Concussion in Sport, Vienna 2001. Recommendations for the improvement of safety and health of athletes who may suffer concussive injuries. Br J Sports Med 36:6–102002
Washington State Legislature: Zackary Lystedt Law HB 1824 61st Legislature 2009 Regular Session (2009) (http://apps.leg.wa.gov/documents/billdocs/2009-10/Pdf/Bill%20Reports/House/1824.E%20HBR%20APH%2009.pdf) [Accessed October 15 2013]