1. Department of Cardiology, Kocaeli University Medical Faculty, Kocaeli, Turkey;
2. Department of Biostatistics, Kocaeli University Medical Faculty, Kocaeli, Turkey;
3. Eregli State Hospital, Zonguldak, Turkey;
4. Kocaeli State Hospital, Kocaeli, Turkey;
5. Derince Education and Research Hospital, Kocaeli, Turkey