Methods The MEDLINE, Embase, Cochrane Central Register of Controlled Trials, PsycINFO, ClinicalTrials.gov and the WHO’s International Clinical Trials Registry Platform search portal were searched from ...
Dr Paul T Francis, Dementia Research Laboratory, Division of Biomolecular Sciences, Guy’s, King’s and St Thomas’ Schools of Biomedical Sciences, King’s College, St Thomas Street, London SE1 9RT, UK.
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Background: The 39 item Parkinson’s disease questionnaire (PDQ-39) is the most widely used patient reported rating scale in Parkinson’s disease. However, several fundamental measurement assumptions ...
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