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Spearman's correlation of the K-NMSS and the subscale items of the K-PDQ-39
*Spearman's rank correlation, p<0.001, †Spearman's rank correlation, p<0.05.
K-NMSS: Korean version-non-motor symptoms scale for Parkinson's disease, K-PDQ-39: Korean version-Parkinson's disease questionnaire.
