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Shumway-Cook A, Silver IF, LeMier M, York S, Cummings P, Koepsell TD.Shumway-Cook A, et al. Among authors: koepsell td.J Gerontol A Biol Sci Med Sci. 2007 Dec;62(12):1420-7. doi: 10.1093/gerona/62.12.1420.J Gerontol A Biol Sci Med Sci. 2007.PMID: 18166695Clinical Trial.