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Bouchard DR, Janssen I.Bouchard DR, et al.J Gerontol A Biol Sci Med Sci. 2010 Jan;65(1):71-7. doi: 10.1093/gerona/glp159. Epub 2009 Nov 3.J Gerontol A Biol Sci Med Sci. 2010.PMID: 19887536