1. Clinic for Infectology, University Clinical Center Niš, 18000 Niš, Serbia
2. Department of Infectious Diseases and Epidemiology, Faculty of Medicine, University of Niš, 18000 Niš, Serbia
3. Clinic for Dermatology, University Clinical Center Niš, 18000 Niš, Serbia
4. Department of Physiology, Faculty of Medicine, University of Niš, 18000 Niš, Serbia