The Olfactory and Cognitive Deficits of Parkinson's Disease:Evidence for Independence
Ann Neurol 25:166-171, Doty,R.L.,et al, 1989
Nonmotor Fluctuations in Patients with Parkinson's Disease
Neurol 47:1180-1183, Hillen,M.E.&Sage,J.I., 1996
The Spectrum of Levodopa-Related Fluctuations in Parkinson's Disease
Neurol 43:1459-1464, Riley,D.E.&Lang,A.E., 1993
The Nonmotor Problems of Parkinson's Disease
The Neurologist 6:18-27, Friedman,J.H.&Fernandez,H.H., 2000
Olfactory Dysfunction in Parkinson's Disease
JNNP 62:436-446, Hawkes,C.H.,et al, 1997
Olfactory Dysfunction in Parkinsonism:A General Deficit Unrelated to Neurologic Signs, Disease Stage, or Duration
Neurol 38:1237-1244, Doty,R.L.,et al, 1988