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Edwards JD, Perkins M, Ross LA, Reynolds SL.Edwards JD, et al.J Gerontol A Biol Sci Med Sci. 2009 Feb;64(2):300-5. doi: 10.1093/gerona/gln019. Epub 2009 Jan 30.J Gerontol A Biol Sci Med Sci. 2009.PMID: 19181711Free PMC article.
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