1. Section of Arctic Veterinary Medicine, Faculty of Food Safety and Infection Biology, Norwegian School of Veterinary Science, NO-9292 Tromsø, Norway
2. Department of Forestry and Wildlife Management, Faculty of Applied Ecology and Agricultural Sciences, Hedmark University College, Campus Evenstad, NO-2418 Elverum, Norway
3. Department of Wildlife, Fish and Environmental Studies, Faculty of Forest Sciences, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
4. Veterinærconsult AS, NO-2580 Folldal, Norway