1. Neonatal Intensive Care Unit, A.O.U. Policlinico G. Rodolico—San Marco, Catania, Italy.
2. Pediatric and Pediatric Emergency Department, University Hospital “Policlinico San Marco,” Catania, Italy.
3. Unit of Clinical Pediatrics, Department of Clinical and Experimental Medicine, Pediatric Postgraduate Training Program, University of Catania, Catania, Italy.
4. Neonatal Intensive Care Unit, Hospital “Villa Sofia Cervello,” Palermo, Italy.
5. Neonatal Intensive Care Unit, Monaldi Hospital, Naples, Italy.
6. Neonatal Intensive Care Unit, Barone Romeo Hospital, Patti, Italy.
7. Neonatal Intensive Care Unit, Hospital “Bianchi-Melacrino-Morelli,” Reggio Calabria, Italy.
8. Unit of Clinical Pediatrics, Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, Catania, Italy.