The Nonmotor Problems of Parkinson's Disease
The Neurologist 6:18-27, Friedman,J.H.&Fernandez,H.H., 2000
A 63-Year-Old Man With Headaches and Behavioral Deterioration
Neurol 68:782-787, Greenberg,S.M.,et al, 2007
Slater Revisited:6 Year Follow Up Study of Pts with Medically Unexplained Motor Symptoms
BMJ 316:582-586, 5641998., Crimlisk,H.L.,et al, 1998