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Semba RD, Bandinelli S, Sun K, Guralnik JM, Ferrucci L.Semba RD, et al. Among authors: sun k.J Am Geriatr Soc. 2009 Oct;57(10):1874-80. doi: 10.1111/j.1532-5415.2009.02438.x. Epub 2009 Aug 13.J Am Geriatr Soc. 2009.PMID: 19682127Free PMC article.