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Parkinson's disease - NHS
What is Parkinson's? | Parkinson's UK
Parkinson's disease - Symptoms - NHS
Parkinson's disease - Symptoms and causes - Mayo Clinic
Homepage | Parkinson's UK
Parkinson's disease - Wikipedia
Parkinson’s Disease: Causes, Symptoms, and Treatments
Parkinson disease - World Health Organization (WHO)
Parkinson's disease - Treatment - NHS
Parkinson's disease - Diagnosis and treatment - Mayo Clinic