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Chan TC, Yap DY, Shea YF, Luk JK, Chu LW, Chan FH.Chan TC, et al.J Am Med Dir Assoc. 2012 Nov;13(9):782-7. doi: 10.1016/j.jamda.2012.08.006. Epub 2012 Sep 13.J Am Med Dir Assoc. 2012.PMID: 22980999