1. Department of Pediatrics, Faculty of Health Sciences, Sancaktepe Prof Ilhan Varank Training and Research Hospital, İstanbul, Turkey
2. Department of Neonatology, Göztepe Prof. Dr. Süleyman Yalçın City Hospital, Istanbul Medeniyet University, Istanbul, Turkey
3. Department of Neonatology, Faculty of Health Sciences, Umraniye Training and Research Hospital, Istanbul, Turkey
4. Department of Ophthalmology, Haydarpasa Numune Training and Research Hospital, Istanbul, Turkey