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In the nineties researchers in the Health Services Research Unit developed the 39-item Parkinson’s Disease Questionnaire (PDQ-39) in order to assess the impact of Parkinson’s disease on health-related quality of life. Recent research has suggested the items and wording are as relevant today as they were when the measure was developed. However, we are taking this opportunity to potentially develop optional modules that could be added to trials aimed at specific aspects of the disease. Further information on these optional modules will be posted here when they are available.

The Participant Information Sheet for this study can be found here.