Valchev1, N. Groseva2, D. Kanakov1, Ts. Hristov1, L. Lazarov1, R. Binev1 1Department of Internal Non-Infectious Diseases, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora, Bulgaria, 2Department of General and Clinical Pathology, Faculty of Veterinary Medicine, Trak
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