1Division of Neonatology, Department of Pediatrics, University of Health Sciences, Etlik Zubeyde Hanim Women's Health Teaching and Research Hospital, 06010 Ankara, Turkey
2Department of Neonatology, Yildirim Beyazit University Faculty of Medicine, Ankara, Turkey
3Department of Pediatrics and Neonatology, University of Health Sciences Turkey, Bilkent City Hospital, 06010 Ankara, Turkey
4Mersin University, Faculty of Medicine, Department of Biostatistics and Medical Informatics, Mersin, Turkey
5Department of Pediatrics and Neonatology, University of Health Sciences Turkey, Etlik City Hospital, 06010 Ankara, Turkey