Concussion
NEJM 356:166-172, Ropper,A.H. &Gorson,K.C., 2007
Benign Exertional Headache
Lance, J. W. In Mechanism and Management of Headache, 5th Ed, Butterworth-Heinemann, Boston, p. 193, , 1993
Weightlifters Headache
Headache 23:193-194, Paulson,G.W., 1983