Frequency of isolation and antimicrobial resistance of gram-negative and gram-positive bacteria from patients in intensive care units of 25 European university hospitals participating in the European arm of the SENTRY Antimicrobial Surveillance Program 1997–1998 - Fluit,A.C.; Verhoef,J.; Schmitz,F.J. (Eur J Clin Microbiol Infect Dis, 2001)