A Ozkaya1, H M Ozkaya2, Z Alkın3, A Demirok3. 1. Beyoglu Eye Training and Research Hospital, Bereketzade Cami Sok., 34421 Beyoglu, Istanbul, Turkey. Electronic address: abdozkaya@gmail.com. 2. Istanbul University, Faculty of Medicine of Istanbul, Internal Medicine Department, 34093 Capa, Fatih, Istanbul, Turkey. 3. Beyoglu Eye Training and Research Hospital, Bereketzade Cami Sok., 34421 Beyoglu, Istanbul, Turkey.