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Liu H, Graber TG, Ferguson-Stegall L, Thompson LV.Liu H, et al. Among authors: graber tg.J Gerontol A Biol Sci Med Sci. 2014 Dec;69(12):1485-91. doi: 10.1093/gerona/glt188. Epub 2013 Dec 13.J Gerontol A Biol Sci Med Sci. 2014.PMID: 24336799Free PMC article.