1. Neonatology and NICU, S. Anna Hospital, Torino, Italy
2. Pediatrics/Neonatal Intensive Care Unit, Division of Pediatrics, Azienda Ospedaliera, Verona, Italy
3. Division of Neonatology and Pediatrics, City Hospital, Thiene, Italy
4. Referral Center for ROP of Piedmont, Torino, Italy