1. Pediatric Emergency Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
2. Specialty School of Pediatrics, Alma Mater Studiorum, University of Bologna, 40126 Bologna, Italy
3. Infectious Diseases Unit, Fondazione IRCCS Ca’ Granda—Ospedale Maggiore Policlinico, 20122 Milano, Italy