Degenerative Diseases of the Nervous System, Parkinson Disease
Adams & Victors Principles of Neurology, Chp 39, pg 1082, Ropper, A.H.,et al, 2014
Parkinson's Disease
Lancet 363:1783-1793, Samii,A.,et al, 2004
Parkinson's Disease
NEJM 339:1044-1053,1130-1143, Lang,A.E.&Lozano,A.M., 1998