Degenerative Diseases of the Nervous System, Parkinson Disease
Adams & Victors Principles of Neurology, Chp 39, pg 1082, Ropper, A.H.,et al, 2014
Treatments of Parkinson Disease
Arch Neurol 60:1680-1684, Shults,C.W., 2003
Surgery for Parkinson's Disease
JNNP 62:2-8, Obeso,J.A.,et al, 1997