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Houben CHM, Spruit MA, Groenen MTJ, Wouters EFM, Janssen DJA.Houben CHM, et al. Among authors: janssen dja.J Am Med Dir Assoc. 2014 Jul;15(7):477-489. doi: 10.1016/j.jamda.2014.01.008. Epub 2014 Mar 2.J Am Med Dir Assoc. 2014.PMID: 24598477Review.