Interventional and observational research are equally important in helping to answer questions, develop new treatments, and ultimately find a cure for Parkinson's.
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Natural history studies that evaluate how Parkinson's affects different people and how it changes over time are another example of observational research.
In 2010, a study was published detailing the progression of Parkinson's-like symptoms in mice following chronic intragastric ingestion of low doses of rotenone.