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Bell CL, Davis J, Harrigan RC, Somogyi-Zalud E, Tanabe MK, Masaki KH.Bell CL, et al.J Am Geriatr Soc. 2009 Apr;57(4):714-8. doi: 10.1111/j.1532-5415.2008.02149.x. Epub 2009 Jan 21.J Am Geriatr Soc. 2009.PMID: 19175434Free PMC article.