4Fluit AC, Jones ME, Schmitz FJ, et al. Antimicrobial re-sistance among urinary tract in fection(UTI) isolated in Europe:results from the SENTRY Antimicrobial Surveillance Program 1997. Antonie Van Leeuwenhoek,2000,77(2) : 147-152.
5Jones RN, Kugler KC, Pfaller MA, et al. Characteristics of pathogens causing urinary tract infection in hospitals in North America: results from the SANTRY Antimierobial Surveillance Program 1997. Diagn Microbiol Infect Dis, 1999,35(1) :55-63.