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APA Citation
Dujardin, K., Moonen, A. J., Behal, H., Defebvre, L., Duhamel, A., Duits, A. A., Plomhause, L., Tard, C., & Leentjens, A. F. (2015). cognitive disorders in Parkinson's disease: Confirmation of a spectrum of severity. Parkinsonism & related disorders, 21(11), 1299–1305. http://access.bl.uk/ark:/81055/vdc_100029218379.0x000016