1. Allergy Unit, A. Meyer Children's Hospital, Department of Pediatrics, the University of Florence, Italy
2. S. Anna Hospital, Department of Pediatrics, Ferrara, Italy
3. S. Salvatore Hospital, Department of Pediatrics, the University of Aquila, Italy
4. Pediatric Infectivology, A. Meyer Children's Hospital, Department of Pediatrics, the University of Florence, Italy