1. Department of Clinical Sciences, School of Veterinary Medicine, Ferdowsi University of Mashhad, Iran
2. Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Iran
3. Graduated Student, School of Veterinary Medicine, Ferdowsi University of Mashhad, Iran
4. Department of Pathobiology, School of Veterinary Medicine, Ferdowsi University of Mashhad, Iran