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Parkinson’s disease (PD) is the second most common neurodegenerative disease after Alzheimer’s disease and affects approximately 8 million people globally and 2% of people over the age of 65. The motor symptoms associated with Parkinson’s disease result from death of dopamine-producing cells in the substantia nigra, a region of the midbrain. These symptoms include slowed movement, tremor, impaired speech and writing, rigidity, and difficulty with walking and gait. In the later stages of PD, swallowing may become difficult. Hallucinations and cognitive and behavioral problems may also manifest. Depression is the most common psychiatric symptom associated with the disease, but sleep disturbances are also very common. As PD progresses, the symptoms gradually become worse, and the patient will be in need of daily assistance. Parkinson’s disease ...

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