1. Clinic of Dermatovenereology, Clinical Centre of Nis, Bovlevard Dr Zorana Djindjica 48, 18000 Nis, Serbia
2. Faculty of Medical Science, University of Kragujevac, Svetozara Markovica 69, 34000 Kragujevac, Serbia
3. Faculty of Medicine, University of Nis, Bovlevard Dr Zorana Djindjica 81, 18000 Nis, Serbia