[1] Univ Florence, Anna Meyer Childrens Univ Hosp, Dept Hlth Sci, Pediat Infect Dis Div, Florence, Italy
[2] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, Naples, Italy
[3] Univ Turin, Regina Margherita Hosp, Pediat Infect Dis Unit, Turin, Italy
[4] Fdn IRCCS Policlin San Matteo, Pediat Clin, Pavia, Italy
[5] Univ Bologna, Pediat Emergency Unit, Bologna, Italy
[6] IRCCS Giannina Gaslini, Infect Dis Unit, Genoa, Italy
[7] IRCCS Bambino Gesu Hosp, Radiol Unit, Rome, Italy
[8] IRCCS, Hosp San Raffaele, Microbiol Unit, Milan, Italy
[9] IRCCS, Bambino Gesu Hosp, Virol Unit, Rome, Italy
[10] Univ Naples Federico II, Pneumol Unit, Naples, Italy
[11] Alma Mater Studiorum Univ Bologna, Dept Med & Surg Sci, Infect Dis Unit, Bologna, Italy
[12] IRCCS, Bambino Gesu Hosp, Unit Gen Pediat & Pediat Infect Dis, Rome, Italy
[13] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Pathophysiol & Transplantat, Pediat Highly Intens Care Unit, Via Commenda 9, I-20122 Milan, Italy