1. Department of Internal Medicine and Clinic of Diseases of Horses, Dogs and Cats , Wrocław , Poland
2. Department of Cardiology , Wrocław , Poland
3. Department of Heart Diseases, Faculty of Health Sciences , Wrocław , Poland
4. Department and Clinic of Surgery, Faculty of Veterinary Medicine, Wrocław University of Environmental and Life Sciences , 50-366 Wrocław , Poland
5. Department of Medical Laboratory Diagnostics, Division of Clinical Chemistry and Laboratory Haematology, Wrocław Medical University , 50-556 Wrocław , Poland