1. Pediatric Department; Department of Clinical and Experimental Medicine; Azienda Ospedaliero-Universitaria; University of Parma; Parma Italy
2. Department of Pediatric Pneumology and Immunology; Charité Medical University; Berlin Germany
3. Pediatric Department and Pediatric Allergology Unit; Sandro Pertini Hospital; Rome
4. Allergology Service; San Carlo Clinic; Paderno Dugnano, Milan
5. Pediatric Unit; Department for Mother and Child; Ramazzini Hospital; Carpi
6. Pediatric Unit; Mazzoni Hospital; Ascoli Piceno
7. Pediatric Unit; Department of Medical and Surgical Sciences; University of Bologna; Bologna
8. Pediatric Department; Second University; Naples
9. Pediatric Department; La Sapienza University; Rome
10. Pediatric Unit; Fatebenefratelli Hospital; Benevento
11. Pediatric Highly Intensive Care Unit; Department of Pathophysiology and Transplantation; Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico; University of Milan; Milan
12. Pediatric Intermediate Care Unit; Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico; Milan
13. Pediatric Section; Department of Life and Reproduction Sciences; University of Verona; Verona
14. Pediatric Department; Policlinico of Tor Vergata; Tor Vergata University; Rome
15. Pediatric Unit; San Giuseppe Hospital; Empoli
16. Pediatric Unit; Grassi Hospital; Rome
17. Pediatric Unit; Santa Barbara Hospital; Iglesias
18. Pulmonary Disease and Allergy Unit; G. Gaslini Hospital; Genoa
19. Pediatric Unit; San Giovanni di Dio Hospital; Crotone
20. Department of Laboratory Medicine; University of Padua; Padua
21. Primary Care Pediatrics; ASL Salerno; Rome
22. UOC Pediatria; San Camillo Forlanini; Rome
23. Department of Statistical Sciences; Sapienza University of Rome; Rome