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Clevenger CK, Chu TA, Yang Z, Hepburn KW.Clevenger CK, et al. Among authors: hepburn kw.J Am Geriatr Soc. 2012 Sep;60(9):1742-8. doi: 10.1111/j.1532-5415.2012.04108.x.J Am Geriatr Soc. 2012.PMID: 22985144Review.