The Nonmotor Problems of Parkinson's Disease
The Neurologist 6:18-27, Friedman,J.H.&Fernandez,H.H., 2000
A 75-Year-Old Man With Cognitive Impairment and Gait Changes, Lewy Body Disease
Neurol 69:1183-1189, Lippa,C.F.,et al, 2007
Disorders of the Autonomic Nervous System:Part 1. Pathophysiology & Clinical Features
Ann Neurol 21:419-430, McLeod,J.G.&Tuck,R.R., 1987