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Musil CM, Gordon NL, Warner CB, Zauszniewski JA, Standing T, Wykle M.Musil CM, et al.Gerontologist. 2011 Feb;51(1):86-100. doi: 10.1093/geront/gnq061. Epub 2010 Aug 19.Gerontologist. 2011.PMID: 20724656Free PMC article.