1. Department of Clinical and Experimental Medicine, Pediatric Clinic, University Hospital, A.U.O. “Policlinico-Vittorio Emanuele,” Catania, Italy
2. National Council of Research, Institute for Biomedical Research and Innovation (IRIB), Unit of Catania, Catania, Italy
3. Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania, Catania, Italy
4. Department of Educational Sciences, Chair of Pediatrics, University of Catania, Catania, Italy
5. Operative Unit of Pediatrics and Neonatal Intensive Therapy, Department of Mother and Child, University of Palermo, Palermo, Italy
6. Department of Pediatrics and Pediatric Emergency, University Hospital, A.U.O. “Policlinico Vittorio Emanuele,” Catania, Italy