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Comparing models of frailty: the Health and Retirement Study.
Cigolle CT, Ofstedal MB, Tian Z, Blaum CS. Cigolle CT, et al. J Am Geriatr Soc. 2009 May;57(5):830-9. doi: 10.1111/j.1532-5415.2009.02225.x. Epub 2009 Apr 21. J Am Geriatr Soc. 2009. PMID: 19453306 Free article.