1. University of Health Sciences Turkey, Ümraniye Training and Research Hospital, Clinic of Pediatrics, Division of Pediatric Endocrinology, İstanbul, Turkey

2. Kocaeli University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Kocaeli, Turkey

3. Koç University Faculty of Medicine, Department of Pediatrics, Division of Pediatric Endocrinology, İstanbul, Turkey

4. Dr. Lütfi Kırdar Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, İstanbul, Turkey

5. Karadeniz Technical University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Trabzon, Turkey

6. Trabzon Kanuni Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, Trabzon, Turkey

7. Ege University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, İzmir, Turkey

8. Adana Women and Children Hospital, Clinic of Pediatrics, Division of Neonatology, Adana, Turkey

9. Ankara University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Ankara, Turkey

10. University of Health Sciences Turkey, Ümraniye Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, İstanbul, Turkey

11. Zekai Tahir Burak Maternity Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, Ankara, Turkey

12. University of Health Sciences Turkey, Ankara Dr. Sami Ulus Maternity Women and Children Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, Ankara, Turkey

13. Pamukkale University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Denizli, Turkey

14. Keçiören Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, Ankara, Turkey

15. Diyarbakır Children Hospital, Clinic of Pediatrics, Division of Neonatology, Diyarbakır, Turkey

16. Van Yüzüncü Yıl University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Van, Turkey

17. Başkent University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Ankara, Turkey

18. Dr. Behçet Uz Children Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, İzmir, Turkey

19. Şişli Hamidiye Etfal Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, İstanbul, Turkey

20. Etlik Zübeyde Hanım Maternity Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, Ankara, Turkey

21. Dicle University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Diyarbakır, Turkey

22. Derince Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, Kocaeli, Turkey

23. Hacettepe University Faculty of Medicine, Department of Pediatrics, Division of Neonatology, Ankara, Turkey

24. Kanuni Training and Research Hospital, Clinic of Pediatrics, Division of Neonatology, İstanbul, Turkey

25. on behalf of Neonatal Study Group