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Song Y, Dowling GA, Wallhagen MI, Lee KA, Strawbridge WJ, Hubbard EM.Song Y, et al.J Gerontol Nurs. 2009 Dec;35(12):20-8; quiz 30-1. doi: 10.3928/00989134-20091109-99. Epub 2009 Dec 11.J Gerontol Nurs. 2009.PMID: 19928708Free article.