1. Neonatal Intensive Care Unit, San Marco Hospital, University Hospital Policlinico “G. Rodolico-San Marco", Catania, Italy.
2. Unit of Pediatrics and Pediatric Emergency, University Hospital Policlinico “G. Rodolico-San Marco”, Catania, Italy.
3. Medical Sciences Department, University of Ferrara, Ferrara, Italy.
4. Postgraduate Training Program in Pediatrics, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy.
5. Microbiology Section, Analysis Laboratory, San Marco Hospital, Catania, Italy.
6. Department of General Surgery and Medical Surgical Specialties, Section of Orthopaedics, A.O.U. Policlinico Rodolico-San Marco, University of Catania, Catania, Italy.
7. Bioinformatics Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy.
8. Unit of Clinical Pediatrics, AOU “Policlinico”, PO “G. Rodolico”, University of Catania, Catania, Italy.