1. Carl von Ossietzky Oldenburg University, University Hospital for Gynecology and Obstetrics, Klinikum Oldenburg AöR , Oldenburg , Germany
2. Obstetrics and Gynecology, Kanuni Sultan Suleyman Education and Research Hospital , Istanbul , Turkey
3. Obstetrics and Gynecology, Sakarya University, Education and Research Hospital , Sakarya , Turkey
4. Department of Obstetrics and Gynecology, Istanbul Cerrahpasa University , Istanbul , Turkey
5. Medical Biochemistry Department, Istinye University, Faculty of Medicine , Istanbul , Turkey