1. Department of Neonatology, Umraniye Research and Training Hospital, İstanbul, Turkey
2. Department of Neonatology, Bağcılar Research and Training Hospital, İstanbul, Turkey
3. Department of Neonatology, Zekai Tahir Burak Maternity Teaching Hospital, Ankara, Turkey
4. Department of Neonatology, Dr Sami Ulus Maternity and Children Research and Training Hospital, Ankara, Turkey