1. Cardiology Clinic, Bahcelievler State Hospital, Istanbul, Turkey.
2. Department of Cardiology, Istanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul, Turkey.
3. Cardiology Clinic, Istanbul Education and Research Hospital, Istanbul, Turkey.
4. Cardiology Clinic, Kirklareli State Hospital, Kirklareli, Turkey.