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The Parkinson's Disease Questionnaire (PDQ-39): development and validation of a Parkinson's disease summary index score.

Jenkinson C, Fitzpatrick R, Peto V, Greenhall R, Hyman N. The Parkinson's Disease Questionnaire (PDQ-39): development and validation of a Parkinson's disease summary index score. Age Ageing. 1997 Sep; 26(5):353-7.

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