Parkinson Disease Subtypes
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Invited Article: Changing Concepts in Parkinson Disease: Moving Beyond the Decade of the Brain
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Cigarette Smoking and Protection from Parkinson's Disease:False Association or Etiologic Clue?
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The Nonenvironmental Basis for Rising Mortality from Parkinson's Disease
Arch Neurol 50:653-656, Riggs,J.E., 1993