1. Faculty of Medicine, University of Niš, Blvd. Zorana Đinđića 81, 18000 Niš, Serbia
2. Clinic of Hematology, Allergology and Clinical Immunology, University Clinical Centre Niš, Blvd. Zorana Đinđića 48, 18000 Niš, Serbia
3. Faculty of Mechanical Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia