1. Department of Ophthalmology, Ulucanlar Eye Training and Research Hospital, Ankara, Turkey
2. Department of Nephrology, Diskapi Yildirim Beyazit Training and Research Hospital, Ankara, Turkey
3. Department of Ophthalmology, Van Ercis State Hospital, Van, Turkey
4. Department of Ophthalmology, Gazi Yasargil Training and Research Hospital, Diyarbakir, Turkey