1. Department of Chemistry, Biochemistry and Biophysics, University of Veterinary Medicine and Pharmacy in Košice, 041 81 Košice, Slovakia.
2. Section of Surgery, Orthopaedics, Roentgenology and Reproduction, Small Animal Clinic, University Veterinary Hospital, University of Veterinary Medicine and Pharmacy in Košice, 041 81 Košice, Slovakia.