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Tracy JA, Dyck PJ.Tracy JA, et al.Phys Med Rehabil Clin N Am. 2008 Feb;19(1):1-26, v. doi: 10.1016/j.pmr.2007.10.010.Phys Med Rehabil Clin N Am. 2008.PMID: 18194747Free PMC article.Review.