1. Memorial Hospital, Fetal Medicine and Perinatology Unit, Istanbul, Turkey
2. Ankara Mevki Military Hospital, Department of Obstetrics and Gynecology, Ankara, Turkey
3. GATA Haydarpasa Training Hospital, Department of Obstetrics and Gynecology, Istanbul, Turkey
4. Necip Fazıl State Hospital, Department of Obstetrics and Gynecology, Kahramanmaraş, Turkey
5. Necip Fazıl State Hospital, Department of Anesthesiology, Kahramanmaraş, Turkey
6. GATA Haydarpasa Training Hospital, Department of Anesthesiology, Istanbul, Turkey