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Stirling LA, Lipsitz LA, Qureshi M, Kelty-Stephen DG, Goldberger AL, Costa MD.Stirling LA, et al.J Gerontol A Biol Sci Med Sci. 2013 Aug;68(8):938-45. doi: 10.1093/gerona/glt003. Epub 2013 Feb 5.J Gerontol A Biol Sci Med Sci. 2013.PMID: 23388876Free PMC article.