1. Medical Faculty, University of Banja Luka, 78000 Banja Luka, Republika Srpska, Bosnia and Herzegovina
2. Department of Pharmacology, Toxicology and Clinical Pharmacology, Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
3. Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
4. Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia