1University of Milan, Milan, Italy
2Laboratory of Microbiology, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
3Pediatric Emergency Department, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
4De Marchi Foundation, Pediatric Area, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
5Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Pediatric Highly Intensive Care Unit, Milan, Italy
6Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
7Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Pediatric Intermediate Care Unit, via Francesco Sforza 9, 20122 Milan, Italy
8Department of Clinical Sciences and Community Health (DISCCO), University of Milan, Milan, Italy
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