National Center for Injury Prevention and Control. Report to Congress on mild traumatic brain injury in the United States, 2003: Steps to prevent a serious public health problem.
Gessel, LM, Fields, SK, Collins, CL, Dick, RW, Comstock, RD. Concussions among United States high school and collegiate athletes. J Athl Train. 2007; 42: 495-503.
Kirkwood, MW, Yeats, KO, Wilson, PE. Pediatric sports-related concussions: A review of the clinical management of an oft-neglected population. Pediatrics. 2006; 117: 1359-1371.
McCrea, M, Hammake, T, Olsen, G, Leo, P, Guskiewicz, K. Unreported concussion in high school football players: Implications for prevention. Clin J Sport Med. 2004; 14: 13-17.
McCrea, M, Guskiewicz, KM, Narshall, SW, Barr, W, Randolph, C, Cantu, RC, Onate, JA, Yang, J, Kelly, JP. Acute effects and recovery time following concussion in collegiate football players : the NCAA Concussion Study. JAMA. 2003; 290: 2556- 2563.