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Validation of diagnostic criteria for apathy in Parkinson's disease.
Drijgers RL, Dujardin K, Reijnders JS, Defebvre L, Leentjens AF. Drijgers RL, et al. Among authors: reijnders js. Parkinsonism Relat Disord. 2010 Dec;16(10):656-60. doi: 10.1016/j.parkreldis.2010.08.015. Epub 2010 Sep 22. Parkinsonism Relat Disord. 2010. PMID: 20864380
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