Surprising sign of Parkinson's disease that appears decades before onset of tremor

Surprising sign of Parkinson's disease that appears decades before onset of tremor
Early signs of Parkinson's disease may manifest as subtle vocal changes, such as a soft or monotonous voice, decades before typical movement symptoms.
Early signs of Parkinson's disease may manifest as subtle vocal changes, such as a soft or monotonous voice, decades before typical movement symptoms.

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