1. Division of Molecular Virology, Medical Faculty, University of Linköping, Linköping, Sweden
2. Department of Forensic Genetics, National Board of Forensic Medicine, Linköping, Sweden
3. Division of Clinical Microbiology, University Hospital, Linköping, Sweden
4. Department of Virology, Statens Serum Institut, Copenhagen, Denmark
5. Department of Microbiology, Hvidovre Hospital, Hvidovre, Denmark
6. Department of Microbiology, Næstved Hospital, Næstved, Denmark
7. Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska University Hospital, Göteborg, Sweden