1. Department of Cardiovascular Surgery, Medical Faculty of Duzce University, Duzce, Turkey
2. Department of Cardiovascular Surgery, Konya Training and Research Hospital, Konya, Turkey
3. Department of Cardiovascular Surgery, Medical Faculty of Afyon Kocatepe University, Afyon, Turkey
4. Department of Biostatistics and Medical Informatics, Medical Faculty of Duzce University, Duzce, Turkey