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Bloomer SA, Zhang HJ, Brown KE, Kregel KC.Bloomer SA, et al. Among authors: zhang hj.J Gerontol A Biol Sci Med Sci. 2009 Apr;64(4):419-25. doi: 10.1093/gerona/gln056. Epub 2009 Feb 4.J Gerontol A Biol Sci Med Sci. 2009.PMID: 19196643Free PMC article.