1 Department of Woman and Child Health and Public Health, Policlinico Universitario Fondazione Agostino Gemelli IRCCS, Rome 00168, Italy; Institute of Pediatrics, Università Cattolica del Sacro Cuore, Rome, Italy; Institute of Microbiology, Università Cattolica del Sacro Cuore, Rome, Italy. Electronic address: danilo.buonsenso@policlinicogemelli.it.
2 Department of Pediatric Emergency Medicine and Trauma Center, Meyer University Children's Hospital, Florence, Italy.
3 Institute of Pediatrics, Università Cattolica del Sacro Cuore, Rome, Italy.
4 Department of Woman and Child Health and Public Health, Policlinico Universitario Fondazione Agostino Gemelli IRCCS, Rome 00168, Italy; Institute of Pediatrics, Università Cattolica del Sacro Cuore, Rome, Italy.