1 Academic Department of Pediatrics (DPUO), Clinical and Research Unit of Clinical Immunology and Vaccinology, IRCCS Bambino Gesuù Children's Hospital, Rome, Italy.
2 Department of Systems Medicine, University of Rome "Tor Vergata," Rome, Italy.
3 Microbiology and Diagnostic Immunology Unit, IRCCS Bambino Gesù Children's Hospital, Rome, Italy.
4 Academic Department of Pediatrics (DPUO), Infectious Disease Unit, IRCCS Bambino Gesu Children's Hospital, Rome, Italy.
5 Department of Pediatrics, IRCCS Bambino Gesu Children's Hospital, Rome, Italy.
6 Health Directorate, IRCCS Bambino Gesù Children's Hospital, Rome, Italy.