1. Clinic of Cardiology, Dr. Siyami Ersek Thoracic and Cardiovascular Surgery Center Training and Research Hospital, Istanbul, Turkey
2. Clinic of Cardiology, Ankara Numune Training and Research Hospital, Ankara, Turkey
3. Clinic of Cardiology, Kadirli State Hospital, Osmaniye, Turkey
4. University Hospital Coventry, Clifford Bridge Rd, Coventry, UK