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    • Missing Data in the Unified Dysksinesia Rating Scale (UDysRS). 

      Luo, Sheng; Ren, Xuehan; Han, Weilu; Goetz, Christopher G; Stebbins, Glenn T (Movement disorders clinical practice, 2018-09)
      Identify the number of allowable missing values still permitting valid surrogate score calculation for the Unified Dyskinesia Rating Scale (UDysRS). Missing data frequently occur in Parkinson's disease rating scales, and ...