1. Department of Cardiology, Health Sciences University, Sultan Abdülhamid Han Training and Research Hospital, Istanbul, Turkey;
2. Department of Cardiology, Kafkas University Medical Faculty, Kars, Turkey;
3. Department of Cardiology, Kars Harakani State Hospital, Kars, Turkey;
4. Department of Internal Medicine, Kafkas University Medical Faculty, Kars, Turkey;
5. Department of Cardiology, Ataturk University Medical School, Erzurum, Turkey