1. Operative Complex Unit of Pediatrics; S. Camillo-Forlanini Hospital; Rome Italy
2. Department of Pediatrics; University of Messina; Messina Italy
3. Operative Complex Unit of Pediatrics and Neonatal Patology; Mazzoni Hospital; Ascoli Piceno Italy
4. Pediatric Respiratory Diseases Unit of the Department of Pediatrics; Allergy Unit of the Department of Respiratory Diseases; University Hospital of Montpellier; Montpellier France
5. Operative Complex Unit of Pediatrics; Hospital of Belcolle Viterbo; Belcolle Viterbo Italy
6. Pediatric Unit; Ramazzini Hospital; Carpi Italy
7. Operative Unit of Pediatric Allergy; San Giuseppe da Copertino Hospital; Copertino Italy
8. Institute of Biomedicine and Molecular Immunology; National Research Council; Palermo Italy
9. L'altrastatistica srl, Consultancy & Training; Biostatistics office; Rome Italy
10. Primary Care Pediatrics; ASL Salerno; Vietri sul Mare Italy