1. Department of Medical Biochemistry and Microbiology, Zoonosis Science Centre, Uppsala University, Uppsala, Sweden
2. Public Health Agency of Sweden, Stockholm, Sweden
3. Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
4. Centre for Occupational and Environmental Medicine, Stockholm County Council, Stockholm, Sweden
5. Symbiant Pathology Expert Centre, Alkmaar, The Netherlands
6. Department of Viroscience, Erasmus MC, Rotterdam, The Netherlands
7. Centre for Infectious Disease Control, Bilthoven, The Netherlands
8. Department of Microbiology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan