1. Pediatric Clinic, Department of Pediatrics, University of Parma, Parma, Italy
2. Allergy Unit, Department of Pediatrics, University of Messina, Messina, Italy
3. Department of Pediatrics, University of Verona, Verona, Italy
4. Pediatric Unit, “Ospedali Riuniti“, University Hospital, Ancona, Italy
5. Pediatric Unit, “Fatebenefratelli” Hospital, Benevento, Italy
6. Pediatric Unit, “San Giuseppe” Hospital, Empoli, Florence, Italy