1. Haartman Institute, Department of Virology, University of Helsinki, Helsinki, Finland
2. Oulu Regional Unit, National Veterinary and Food Research Institute, Oulu, Finland
3. Joensuu Game and Fisheries Research, Finnish Game and Fisheries Research Institute, Joensuu, Finland
4. Turku Game and Fisheries Research, Finnish Game and Fisheries Research Institute, Turku, Finland
5. Department of Basic Veterinary Sciences, University of Helsinki, Helsinki, Finland
6. Saari Unit, Department of Clinical Veterinary Sciences, University of Helsinki, Saarentaus, Finland