Authors
Sofiya Ivanova
Non-infectious Diseases Unit, National Diagnostic and Research Veterinary Medical Institute, Sofia, Bulgaria
Dimitrichka Dimitrova
Department of Internal Non-infectious Diseases, Pathology and Pharmacology, Faculty of Veterinary Medicine of the University of Forestry, Sofia, Bulgaria
Metodi Petrichev
Non-infectious Diseases Unit, National Diagnostic and Research Veterinary Medical Institute, Sofia, Bulgaria