1. Cardiology Clinic, Karabuk State Hospital, Karabuk, Turkey.
2. Dept. of Cardiology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
3. Dept. of Nephrology, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
4. Dept. of Cardiology, Faculty of Medicine, Karabuk University, Karabuk, Turkey.