Precipitous Deterioration of Motor Function, Cognition, and Behavior
JAMA Neurol 74:591-596, Fernandez-Fournier, M.,et al, 2017
Degenerative Diseases of the Nervous System, Parkinson Disease
Adams & Victors Principles of Neurology, Chp 39, pg 1082, Ropper, A.H.,et al, 2014