Posttraumatic Headache
Semin Neurol 14:40-45, Packard,R.C., 1994
Mild Head Injury
(Ed) , Semin Neurol 14:1-9294., Packard,R.C., 1994
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