1. Faculty of Natural Sciences and Mathematics, Department of Biology , University of Banja Luka , dr Mladena Stojanovića 2, Banja Luka , Republic of Srpska, Bosnia and Herzegovina ;
2. Faculty of Medicine, Department of Pathology , University of Banja Luka , Save Mrkalja 14, Banja Luka , Republic of Srpska, Bosnia and Herzegovina ;
3. Faculty of Agriculture, Department of Veterinary , University of Novi Sad , Square Dositeja Obradovića 8, Novi Sad , Serbia