1. Department of Pathology and Veterinary Diagnostics , Warsaw , Poland
2. Department of Small Animal Diseases with Clinic , Warsaw , Poland
3. Division of Veterinary Epidemiology and Economics , Warsaw , Poland
4. Department of Large Animal Diseases and Clinic , Warsaw , Poland
5. Department of Physiology, Institute of Veterinary Medicine, Warsaw University of Life Sciences , 02-776 Warsaw , Poland
6. Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Toruń , 87-100 Toruń , Poland