Answers are grounded in this paper and cite their sources.
Death rates for Parkinson's Disease (PD) in the U.S.A. and the state of Georgia were investigated for the period 1979-83. Age adjusted death rates for the U.S.A. were greater in whites than blacks and greater in men and women. No differences were found in Georgia between urban and rural counties. Death rates were not higher in countries containing paper mills.
No takes yet. Share an insight, caveat, or question.
Sethi et al. (1989) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: