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Keller HH, Gibbs-Ward A, Randall-Simpson J, Bocock MA, Dimou E.Keller HH, et al. Among authors: randall simpson j.J Am Med Dir Assoc. 2006 Jan;7(1):40-5. doi: 10.1016/j.jamda.2005.06.009. Epub 2005 Oct 21.J Am Med Dir Assoc. 2006.PMID: 16413434Review.