Degenerative Diseases of the Nervous System, Parkinson Disease
Adams & Victors Principles of Neurology, Chp 39, pg 1082, Ropper, A.H.,et al, 2014
Parkinsons Disease
Lancet 373:2055-2066, Lees,A.J.,et al, 2009
Parkinson Disease Subtypes
JAMA 71:499-504, Thenganatt, M. & Jankovic, J., 2014