[1] UNIV ROTTERDAM HOSP,DEPT BACTERIOL,NL-3015 GD ROTTERDAM,NETHERLANDS
[2] UNIV NIJMEGEN HOSP,DEPT CLIN PHARM,NL-6500 HB NIJMEGEN,NETHERLANDS
[3] MALMO GEN HOSP,DEPT MED MICROBIOL,S-20502 MALMO,SWEDEN
[4] UNIV LEIDEN HOSP,DEPT MED MICROBIOL,NL-2300 RC LEIDEN,NETHERLANDS
[5] JULIANA CHILDRENS HOSP,NL-2566 MJ THE HAGUE,NETHERLANDS