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Somwaru LL, Arnold AM, Cappola AR.Somwaru LL, et al.J Gerontol A Biol Sci Med Sci. 2011 Jul;66(7):809-14. doi: 10.1093/gerona/glr063. Epub 2011 May 31.J Gerontol A Biol Sci Med Sci. 2011.PMID: 21628677Free PMC article.