1. Mammal Research Institute Polish Academy of Sciences Białowieża Poland
2. Department of Game Management and Wildlife Biology, Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Czech Republic
3. National Wildlife Research Center USDA, APHIS, Wildlife Services Fort Collins Colorado USA
4. Department of Animal Molecular Biology National Research Institute of Animal Production Balice Poland
5. Department of Swine Diseases National Veterinary Research Institute Pulawy Poland
6. Deparment of Diagnosis and Clinical Sciences, Faculty of Biological and Veterinary Sciences Nicolaus Copernicus University Torun Poland