1. Department of Pathophysiology, Forensic Veterinary Medicine, and Administration, University of Warmia and Mazury, 10-719 Olsztyn, Poland
2. Department of Animal Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury, 10-719 Olsztyn, Poland
3. Department of Swine Diseases, National Veterinary Research Institute, 24-100 Pulawy, Poland