Institute for Maternal & Child Health, IRCCS "Burlo Garofolo", Anna Meyer Children’s University Hospital - Department of Pediatric Emergency Medicine and Trauma Center, Anna Meyer Children’s University Hospital - Department of Health Sciences, University of Verona - Verona University Hospital - Department of Neonatal and Paediatric Critical Care, University of Verona - Verona University Hospital - Department of Neonatal and Paediatric Critical Care, Institute for Maternal & Child Health, IRCCS "Burlo Garofolo", IRCCS Gaslini Children's Hospital - Pediatric Emergency Unit, IRCCS Gaslini Children's Hospital - Pediatric Emergency Unit, Misericordia Hospital - Pediatric Emergency Unit and Department of Pediatric and Neonatology, The Children Hospital, AO SS Antonio e Biagio e Cesare Arrigo - Pediatric and Pediatric Emergency Unit, The Children Hospital, AO SS Antonio e Biagio e Cesare Arrigo - Pediatric and Pediatric Emergency Unit, Pediatria d'Urgenza e Pronto Soccorso P.O.G. Di Cristina, P.O.G. Di Cristina - Pediatric Infectious Diseases, Institute for Maternal & Child Health, IRCCS "Burlo Garofolo", Institute for Maternal & Child Health, IRCCS "Burlo Garofolo", Ravenna Hospital - Department of Pediatrics, Community Pediatrics - Department of Pediatrics, Treviso General Hospital - Department of Pediatrics, Treviso General Hospital - Department of Pediatrics, G.B. Morgagni-L. Pierantoni Hospital - Pediatric Department, G.B. Morgagni-L. Pierantoni Hospital - Pediatric Department, Santa Maria degli Angeli Hospital - Department of Pediatrics and Neonatology, Santa Maria degli Angeli Hospital - Department of Pediatrics and Neonatology, Carlo Poma Hospital - Paediatric Unit, Fondazione Policlinico Universitario A. Gemelli IRCCS - Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A. Gemelli IRCCS - Department of Woman and Child Health and Public Health, San Polo Hospital - Pediatric Department, San Polo Hospital - Pediatric Department, University of Udine - Division of Paediatrics, University of Udine - Division of Paediatrics, Latisana-Palmanova, ASUFC - Department of Pediatrics, Latisana-Palmanova, ASUFC - Department of Pediatrics, "Cannizzaro" Emergency Hospital - Pediatric and Pediatric Emergency Room Unit, "Cannizzaro" Emergency Hospital - Pediatric and Pediatric Emergency Room Unit, University of Bari - Giovanni XXIII Pediatric Hospital, University of Bari - Giovanni XXIII Pediatric Hospital, Sapienza University of Rome, Sapienza University of Rome - Department of Pediatrics, Maggiore della Carità University Hospital - Neonatal and Pediatric Intensive Care Unit, IRCCS “Burlo Garofolo” - Institute for Maternal and Child Health and IRCCS “Burlo Garofolo” - Institute for Maternal and Child Health