1. Division of Neonatology; Samsun Maternity and Child Health Hospital; Samsun; Turkey
2. Division of Neonatology; Mersin Maternity and Child Health Hospital; Mersin; Turkey
3. Division of Neonatology; Zekai Tahir Burak Maternity Teaching Hospital; Ankara; Turkey
4. Department of Neonatology; Ankara University Medical Faculty; Ankara; Turkey
5. Department of Biostatistics; Ankara University Medical Faculty; Ankara; Turkey