1. Department of Cardiology, Faculty of Medicine, Ataturk University, Erzurum, Turkey
2. Department of Cardiology, Dogubeyazit State Hospital, Agri, Turkey
3. Department of Cardiology, Faculty of Medicine, Erzincan University, Erzincan, Turkey
4. Department of Cardiology, Faculty of Medicine, Kafkas University, Kars, Turkey
5. Department of Public Health, Faculty of Medicine, Ataturk University, Erzurum, Turkey