1. University Clinical Center of Serbia, University Eye Clinic, Belgrade, Serbia
2. Zvezdara University Medical Center, Prof. dr Ivan Stanković Clinic for Eye Diseases, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
3. University Clinical Center of Serbia, University Eye Clinic, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
4. University Clinical Center of the Republic of Srpska, Eye Clinic, Banja Luka, Bosnia and Herzegovina