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Liu CJ, Jones LY, Formyduval A RM, Clark DO.Liu CJ, et al.J Aging Phys Act. 2016 Jul;24(3):384-92. doi: 10.1123/japa.2015-0070. Epub 2015 Nov 19.J Aging Phys Act. 2016.PMID: 26583695Free PMC article.