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Gitlin LN, Hauck WW, Dennis MP, Winter L.Gitlin LN, et al.J Gerontol A Biol Sci Med Sci. 2005 Mar;60(3):368-74. doi: 10.1093/gerona/60.3.368.J Gerontol A Biol Sci Med Sci. 2005.PMID: 15860476Clinical Trial.