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Blazer DG, Sachs-Ericsson N, Hybels CF.Blazer DG, et al.J Gerontol A Biol Sci Med Sci. 2007 Feb;62(2):191-5. doi: 10.1093/gerona/62.2.191.J Gerontol A Biol Sci Med Sci. 2007.PMID: 17339645