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El Helou A, Bastuji-Garin S, Paillaud E, Gracies JM, Skalli W, Decq P.El Helou A, et al.J Am Med Dir Assoc. 2012 Mar;13(3):279-83. doi: 10.1016/j.jamda.2010.12.008. Epub 2011 Jan 13.J Am Med Dir Assoc. 2012.PMID: 21450233