The Parkinson's Disease Questionnaire (PDQ-39): development and validation of a Parkinson's disease summary index score
Open Access
- 1 September 1997
- journal article
- research article
- Published by Oxford University Press (OUP) in Age and Ageing
- Vol. 26 (5), 353-357
- https://doi.org/10.1093/ageing/26.5.353