1. Department of Cardiology, Kafkas University Medical Faculty, Kars, Turkey.
2. Department of Cardiology, Kars Harakani State Hospital, Kars, Turkey.
3. Department of Cardiology, Gaziemir State Hospital, İzmir, Turkey.
4. Department of Cardiology, Ağrı State Hospital, Ağrı, Turkey.
5. Department of Cardiovascular Surgery, Kafkas University Medical Faculty, Kars, Turkey.
6. Department of Cardiology, Ataturk University Medical Faculty, Erzurum, Turkey.