1. Railway Health Institute, Ophthalmology Department, Belgrade
2. Faculty of Medicine, Belgrade + Clinical Centre of Serbia, Clinic for Eye Diseases, Belgrade
3. Faculty of Medicine, Belgrade + Institute for Medical Statistics and Informatics, Belgrade
4. Primary Health Centre “Euromedic“, Belgrade
5. Health Center Kosovska Mitrovica, Kosovska Mitrovica + Faculty of Medicine, Kosovska Mitrovica