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Keith N, Bronson RT, Lipman RD, Ding W, Lamont L, Cosmas AC, Manfredi TG.Keith N, et al. Among authors: cosmas ac.J Am Aging Assoc. 2000 Jul;23(3):141-5. doi: 10.1007/s11357-000-0016-7.J Am Aging Assoc. 2000.PMID: 23604854Free PMC article.