1. Clinical Hospital Center Zvezdara, Department of Internal Medicine, Belgrade, Serbia
2. University Clinical Center Kragujevac, Clinic for Ophthalmology, Kragujevac, Serbia + University of Kragujevac, Faculty of Medical Sciences, Department of Ophthalmology, Kragujevac, Serbia
3. University Clinical Center Kragujevac, Center for Plastic Surgery, Kragujevac, Serbia + University of Kragujevac, Faculty of Medical Sciences, |Department of Surgery, Kragujevac, Serbia
4. University Clinical Center Niš, Clinic for Ophthalmology, Niš, Serbia
5. Aero Medical Institute, Belgrade, Serbia