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We examined the prevalence and risk of clinical symptoms in a large number of Japanese patients with Parkinson's disease (PD) (n = 1453; 650 males).Events were analyzed using Kaplan–Meier survival curves, logistic regression, and Cox proportional-hazards models.The mean age (SD) was 67.7 (10.0), age of onset was 58.0 (11.5), and disease duration was 9.7 (6.6) years. The mean modified Hoehn and Yahr...
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