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Andrews AL, Simpson AN, Basco WT Jr, Teufel RJ 2nd.Andrews AL, et al.Medicare Medicaid Res Rev. 2013 Dec 16;3(4):mmrr.003.04.a05. doi: 10.5600/mmrr.003.04.a05. eCollection 2013.Medicare Medicaid Res Rev. 2013.PMID: 24834366Free PMC article.