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Fisk JE, Warr PB.Fisk JE, et al. Among authors: warr pb.J Gerontol B Psychol Sci Soc Sci. 1998 Mar;53(2):P112-21. doi: 10.1093/geronb/53b.2.p112.J Gerontol B Psychol Sci Soc Sci. 1998.PMID: 9520928