1. Department of Anesthesiology and Reanimation University of Health Sciences, Erzurum Regional Training and Research Hospital Erzurum Turkey
2. Department of Anesthesiology and Reanimation, Faculty of Medicine Ataturk University Erzurum Turkey
3. Anesthesiology Clinical Research Office Ataturk University Erzurum Turkey
4. Department of Biostatistics Faculty of Medicine, Ataturk University Erzurum Turkey
5. Department of Obstetrics and Gynecology, Faculty of Medicine Ataturk University Erzurum Turkey
6. Department of Anesthesiology and Reanimation Altınbas University İstanbul Turkey