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Vriens MR, Fluit AC, Troelstra A, Verhoef J, van der Werken C.Vriens MR, et al. Among authors: verhoef j.Infect Control Hosp Epidemiol. 2002 Sep;23(9):491-4. doi: 10.1086/502094.Infect Control Hosp Epidemiol. 2002.PMID: 12269444