1. Institute of Applied Biology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra , Tr. A. Hlinku 2 , 949 76 Nitra , Slovakia
2. Third Intern Clinic, Comenius University in Bratislava , Bratislava , Slovakia
3. Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy in Košice , Košice , Slovakia
4. Institute of Medical Chemistry and Clinical Biochemistry, Comenius University in Bratislava , Bratislava , Slovakia