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Ho PL, Wang TK, Ching P, Mak GC, Lai E, Yam WC, Seto WH.Ho PL, et al. Among authors: yam wc.Infect Control Hosp Epidemiol. 2007 Jun;28(6):671-8. doi: 10.1086/517951. Epub 2007 Apr 19.Infect Control Hosp Epidemiol. 2007.PMID: 17520539