1. Research Group for Antimicrobial Resistance and Molecular Epidemiology, Department for Microbiology and Risk Assessment, National Food Institute, Technical University of Denmark, Copenhagen V, Denmark.
2. Statens Serum Institut (SSI), DK-Copenhagen S, Denmark.
3. Department for Veterinary Pathobiology, Faculty of Life Sciences, University of Copenhagen, Frederiksberg C, Denmark.
4. Department of Clinical Microbiology, Copenhagen Community Hospital Herlev, Herlev, Denmark.