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Davydow DS, Hough CL, Russo JE, Von Korff M, Ludman E, Lin EH, Ciechanowski P, Young B, Oliver M, Katon WJ.Davydow DS, et al.Int J Geriatr Psychiatry. 2012 Jan;27(1):22-30. doi: 10.1002/gps.2684. Epub 2011 Feb 9.Int J Geriatr Psychiatry. 2012.PMID: 21308790Free PMC article.