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Dayhoff-Brannigan M, Ferrucci L, Sun K, Fried LP, Walston J, Varadhan R, Guralnik JM, Semba RD.Dayhoff-Brannigan M, et al. Among authors: guralnik jm.J Gerontol A Biol Sci Med Sci. 2008 Feb;63(2):179-83. doi: 10.1093/gerona/63.2.179.J Gerontol A Biol Sci Med Sci. 2008.PMID: 18314454Free PMC article.