1. Unit of Pediatric Emergency, Department of Human Pathology of the Adult and Developmental Age “Gaetano Barresi,” University of Messina, Messina, Italy
2. Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
3. Pediatric Clinic–Department of Life, Health and Environmental Sciences–Piazzale Salvatore, Coppito (AQ), Italy
4. Department of Pediatrics, University of L'Aquila, Via Vetoio, L'Aquila, Italy