1. Microbiology and Infection Control; Statens Serum Institute; Artillerivej 5 DK-2300 Copenhagen S Denmark
2. Department of Clinical Microbiology 9321; Copenhagen University Hospital; Rigshospitalet; Blegdamsvej 9 DK-2100 Copenhagen Denmark
3. Department of Infection Control 9101; Copenhagen University Hospital; Rigshospitalet; Blegdamsvej 9 DK-2100 Copenhagen Denmark