1 Division of Perinatology, American Hospital, Sisli, Istanbul, Turkey.
2 Department of Obstetrics and Gynecology, Zeynep Kamil Women and Children's Diseases Training and Research Hospital, Istanbul, Turkey.
3 Women's Health Center and Assisted Reproduction Unit, American Hospital, Guzelbahce sokak No. 20, Nisantasi 34065, Sisli, Istanbul, Turkey. Electronic address: mceyhan85@hotmail.com.