1. Department of Medical Sciences “M. Aresu”, University of Cagliari, Cagliari, Italy;
2. Department of Pediatrics and Clinical Medicine, Section of Neonatal Intensive Care Unit, University of Cagliari, Cagliari, Italy;
3. Pediatric Cardiology Unit, AOU Sassari, Sassari, Italy;
4. Pediatric Clinic, University of Sassari, Sassari, Italy