1. Vezirkopru State Hospital, Cardiology Clinic, Samsun, Turkey
2. Samsun Education and Research Hospital, Cardiology Clinic, Samsun, Turkey
3. Koru Hospital, Cardiology Clinic, Ankara, Turkey
4. Artvin State Hospital, Cardiology Clinic, Artvin, Turkey
5. Fatsa State Hospital, Cardiology Clinic, Ordu, Turkey
6. Sivas Cumhuriyet University School of Medicine, Department of Cardiology, Sivas, Turkey