3Freeman J,et al.Differential risks of nosocomial infection. The American Journal of Medicine . 1981
4Gaunt PN,et al.Computer and hospital infections. Journal of Hospital Infection . 1987
5Haley RW,et al.CDC--SENIC planning committee; Study on the Efficacy of Nosocomial Infection Control (SENIC projest): Summary of study design. American Journal of Epidemiology . 1980
6Hooton TM. et al.The joint associations of multiple risk factors with the occurrence of nosocomial infection. The American Journal of Medicine . 1981
7Clark N M, Patterson J, Lynch J P 3rd. Antimicrobial resistance a-mong gram-negative organisms in the intensive care unit[ J]. Curr Opin Crit Care,2003,9(5) :413 -23.
8National Committee for Clinical Laboratory Standards. Performance standards for anfimicrohlal susceptibility testing [ S ]. 9th Infomuaional Supplemented, Wayne PA:National Committee for Clinical Laboratory Standards,2008:36.
