1. Department of Neonatology, Etlik Zubeyde Hanım Women’s Teaching and Research Hospital, Ankara, Turkey;
2. Department of Obstetrics and Gynecology, Etlik Zubeyde Hanım Women’s Teaching and Research Hospital, Ankara, Turkey;
3. Department of Neonatology, Yildirim Beyazit University Faculty of Medicine, Ankara, Turkey;
4. Department of Neonatology, Konya Teaching and Research Hospital, Konya, Turkey;
5. Department of Biochemistry, Yildirim Beyazit University Medical Faculty, Ankara, Turkey