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To develop a short, practical instrument that is sensitive to the specific cognitive deficits in Parkinson’s disease (PD) for comparing groups in research situations and for assessing change in cognitive functioning over time
Marinus J, Visser M, Verwey NA, Verhey FR, Middelkoop HA, Stiggelbout AM, van Hilten JJ. Assessment of cognition in Parkinson's disease. Neurology. 2003 Nov 11;61(9):1222-8 (PubMed Abstract)