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Vaz Fragoso CA, Gahbauer EA, Van Ness PH, Gill TM.Vaz Fragoso CA, et al. Among authors: gahbauer ea.J Gerontol A Biol Sci Med Sci. 2007 Oct;62(10):1147-51. doi: 10.1093/gerona/62.10.1147.J Gerontol A Biol Sci Med Sci. 2007.PMID: 17921429Free PMC article.