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Parkinson 's disease (PD) is a chronic and often progressive neurodegenerative disease, in its advanced stages often accompanied by postural instability and gait disturbance. The main risk factor for PD is advancing age, with worldwide prevalence estimates ranging from 0.43% for those aged 60 to 69 years, 1% for those aged 70 to 79 and 1.9% for those over 80 years old.
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