Concussion
NEJM 356:166-172, Ropper,A.H. &Gorson,K.C., 2007
Acute Effects and Recovery Time Following Concussion in Collegiate Football Players
JAMA 290:2556-2563,2604, McCrea,M.,et al, 2003
Cumulative Effects Associated with Recurrent Concussion in Collegiate Football Players
JAMA 290:2549-2555,2604, Guskiewicz,K.M.,et al, 2003