1. Section of Arctic Veterinary Medicine, Department 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. Veterinærconsult AS, Wintherbakken 21, NO-3016 Drammen, Norway
4. Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway
5. Norwegian Polar Institute, NO-9296, Tromsø, Norway
6. Direktoratet for Naturforvaltning, NO-7042 Trondheim, Norway
7. Department of Wildlife, Fish and Environmental Studies, Faculty of Forest Sciences, Swedish University of Agricultural Sciences, SE-901 83 Umea, Sweden