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Maglione JE, Ancoli-Israel S, Peters KW, Paudel ML, Yaffe K, Ensrud KE, Stone KL.Maglione JE, et al.J Am Geriatr Soc. 2012 Apr;60(4):635-43. doi: 10.1111/j.1532-5415.2012.03908.x. Epub 2012 Mar 16.J Am Geriatr Soc. 2012.PMID: 22428562Free PMC article.