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Rich SE, Gruber-Baldini AL, Quinn CC, Zimmerman SI.Rich SE, et al.J Am Geriatr Soc. 2009 Jan;57(1):146-52. doi: 10.1111/j.1532-5415.2008.02090.x.J Am Geriatr Soc. 2009.PMID: 19170791Free PMC article.