1. Department of Health Sciences, Paediatric Infectious Diseases Unit, Department of Paediatric Medicine, Anna Meyer Children’s University Hospital, Firenze, Italy
2. University and Hospital Pediatric Department, Pediatric and Infectious Disease Unit, Children Hospital Bambino Gesù, Rome, Italy
3. Department of Public Health and Pediatric Sciences, University of Turin, Pediatric Unit, Regina Margherita Children’s University Hospital, Turin, Italy
4. Pediatric Clinic, Department of Surgical and Biomedical Sciences, University of Studies of Perugia, Perugia, Italy
5. Department of Translational Medical Sciences – Section of Pediatrics, Pediatric Infectious Diseases Unit, University of Naples Federico II, Naples, Italy
6. Department of Reproduction and Growth, St. Anna Hospital, Ferrara, Italy
7. Department of Pediatrics, “Dell’Angelo” Hospital, Verona, Italy
8. Department of Pediatrics, Parma University Hospital, Parma, Italy
9. IRCCS Giannina Gaslini, Infectious Diseases Unit, Genua, Italy
10. Department of Child and Maternal Health, Pediatric Clinic, “Ss. Annunziata Hospital”, Chieti, Italy
11. Institute of Pediatrics, Catholic University of Sacred Heart, Gemelli Hospital, Rome, Italy
12. Department of Pediatrics and Respiratory Allergies, Giovanni XXIII Pediatric Hospital, Bari, Italy
13. Department of Pediatrics, University of Milan- ASST Santi Paolo e Carlo, Milan, Italy
14. Pediatric Division, “Maggiore Carità” Hospital, University of Piemonte orientale, Novara, Italy
15. Pediatric Clinic, University of Pavia, IRCCS Policlinico “S. Matteo” Foundation, Pavia, Italy
16. Department of Woman, Child, and General and Specialistic Surgery, Second University of Studies of Naples, Naples, Italy
17. Desio Hospital, Pediatrics and Neonatology Unit, Desio, Italy
18. Pediatric Emergency Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
19. Department of Internal Medicine and Public Health, University of L’Aquila, L’Aquila, Italy