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Espay AJ, Fasano A, van Nuenen BF, Payne MM, Snijders AH, Bloem BR.Espay AJ, et al.Neurology. 2012 Feb 14;78(7):454-7. doi: 10.1212/WNL.0b013e3182477ec0. Epub 2012 Jan 18.Neurology. 2012.PMID: 22262741Free PMC article.