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  1. Parkinson's disease - Symptoms and causes - Mayo Clinic

  2. Parkinson’s Disease: Causes, Symptoms, and Treatments

  3. Parkinson's disease - Wikipedia

  4. What is Parkinson's? | Parkinson's Foundation

  5. Parkinson's disease - Diagnosis and treatment - Mayo Clinic

  6. Parkinson’s Disease: What It Is, Causes, Symptoms & Treatment

  7. Parkinson's Disease | National Institute of Neurological Disorders …

  8. Parkinson disease - World Health Organization (WHO)

  9. Parkinson’s disease | National Institute on Aging

  10. Parkinson's Disease | Johns Hopkins Medicine