1. Clinic for Eye Diseases, Faculty of Medicine, Settlement Kosovska Mitrovica, Belgrade
2. Institute for Eye Diseases, Faculty of Medicine, University of Belgrade, Belgrade
3. Biochemistry Institute, Faculty of Medicine, Settlement Kosovska Mitrovica, Novi Sad
4. Clinic for Eye Diseases, Faculty of Medicine, Novi Sad
5. Biochemistry Institute, Faculty of Medicine, Nis - Serbia