1. Statens Serum Institut, Copenhagen, Denmark
2. Department of Clinical Microbiology, Herlev University Hospital, Herlev, Denmark
3. Department of Clinical Microbiology, Odense University Hospital, Odense, Denmark
4. Department of Clinical Microbiology, Nordsjællands Hospital, Hillerød, Denmark
5. Department of Clinical Microbiology, Aalborg Sygehus Syd, Aalborg, Denmark