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Jaconelli A, Stephan Y, Canada B, Chapman BP.Jaconelli A, et al. Among authors: chapman bp.J Gerontol B Psychol Sci Soc Sci. 2013 Jul;68(4):553-7. doi: 10.1093/geronb/gbs094. Epub 2012 Oct 15.J Gerontol B Psychol Sci Soc Sci. 2013.PMID: 23070900Free PMC article.