1 Department of Obstetrics and Gynecology, Turkish Ministry of Health Ankara City Hospital, Ankara 06800, Turkey; University of Health Sciences, Istanbul, Turkey.
2 Department of Obstetrics and Gynecology, Turkish Ministry of Health Ankara City Hospital, Ankara 06800, Turkey. Electronic address: atakantanacan@yahoo.com.
3 Department of Obstetrics and Gynecology, Turkish Ministry of Health Ankara City Hospital, Ankara 06800, Turkey; University of Health Sciences, Istanbul, Turkey; Maternity Hospital, Turkish Ministry of Health Ankara City Hospital, Ankara, Turkey.