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Ryan EB, Bieman-Copland S, See ST, Ellis CH, Anas AP.Ryan EB, et al. Among authors: ellis ch.J Gerontol B Psychol Sci Soc Sci. 2002 May;57(3):P256-67. doi: 10.1093/geronb/57.3.p256.J Gerontol B Psychol Sci Soc Sci. 2002.PMID: 11983737