1. Department of Cardiovascular Surgery, Gazi University Medical Faculty, 06570 Ankara, Turkey
2. Department of Cardiovascular Surgery, Sivas Numune Hospital, 58380 Sivas, Turkey
3. Department of Histology and Embriyology, Kırıkkale University, 71300 Kırıkkale, Turkey
4. Department of Anaesthesiology and Reanimation, Gazi University Medical Faculty, 06510 Ankara, Turkey
5. Department of Medical Biochemistry, Gazi University Medical Faculty, 06510 Ankara, Turkey