1. Department of Pathophysiology, Forensic Veterinary Medicine and Administration, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland
2. Department of Surgery, Wroclaw University of Environmental and Life Sciences, 50-366 Wroclaw, Poland
3. Department of Medical Pathomorphology, Medical University of Bialystok, 15-269 Bialystok, Poland