1. Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen S, Denmark;
2. Department of Clinical Microbiology, Hvidovre Hospital, Hvidovre, Denmark
3. Department of Infectious Disease Epidemiology, Statens Serum Institut, Copenhagen S, Denmark;
4. Department of Clinical Microbiology, Rigshospitalet, Copenhagen Ø, Denmark;