1. Department of Medical and Surgical Neonatology, Bambino Gesù Children’s Hospital, Rome, Italy;
2. Department of Ophthalmology, Bambino Gesù Children’s Hospital, Rome, Italy;
3. Unit of Clinical Epidemiology, Bambino Gesù Children’s Hospital, Rome, Italy;
4. Department of Anesthesiology, Bambino Gesù Children’s Hospital, Rome, Italy