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Umscheid CA, Mitchell MD, Doshi JA, Agarwal R, Williams K, Brennan PJ.Umscheid CA, et al.Infect Control Hosp Epidemiol. 2011 Feb;32(2):101-14. doi: 10.1086/657912.Infect Control Hosp Epidemiol. 2011.PMID: 21460463Review.