Comparison of the Prevalence of Parkinson's Disease in Black Populations in the Rural US & Nigeria
Neurol 38:645-646, Schoenberg,B.S.,et al, 1988
Prevalence of Parkinson's Disease in the Biracial Population of Copiah County, Mississippi
Neurol 35:841-845, Schoenberg,B.S.,et al, 1985