With the acceleration of the population aging process and decrease of physical functions of senile patients, the incidence and prevalence of PD have shown an increasing trend year by year ( Nussbaum and Ellis, 2003 ; Hirsch et al., 2016 ).
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With the acceleration of the population aging process and decrease of physical functions of senile patients, the incidence and prevalence of PD have shown an increasing trend year by year ( Nussbaum and Ellis, 2003 ; Hirsch et al., 2016 ).