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Constipation is a non-motor symptom of Parkinson's disease (PD). We investigated the association between the severity of constipation and subsequent risk of PD in a population-based sample.551,324 participants free of PD, dementia, and stroke were retrospectively ascertained between January 1, 2005 and December 31, 2005 using the Taiwan National Health Insurance Research Database. The association...
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