[1] Univ Padua, Dept Woman & Child Hlth, Div Pediat Infect Dis, I-35128 Padua, Italy
[2] Fdn IRCCS CaGranda Osped Maggiore Policlin, Pneumol & Infect Dis Unit, I-20122 Milan, Italy
[3] IRCCS Ist Giannina Gaslini, Dept Pediat, Infect Dis Unit, I-16147 Genoa, Italy
[4] Univ Palermo, G Cristina Hosp, Div Pediat Infect Dis, ARNAS Civ Cristina Benfratelli, I-90134 Palermo, Italy
[5] Univ Florence, Dept Hlth Sci, I-50139 Florence, Italy
[6] Meyer Childrens Univ Hosp, Infect Dis Unit, IRCCS, I-50139 Florence, Italy
[7] IRCCS, Bambino Gesu Childrens Hosp, Infect Dis Unit, I-00165 Rome, Italy
[8] Feder II Univ, Dept Translat Med Sci, I-80138 Naples, Italy
[9] Univ Modena & Reggio Emilia, Dept Infect Dis, Azienda Ospedaliero Univ Modena, I-41125 Modena, Italy
[10] Parma Univ Hosp, Univ Parma, Dept Med & Surg, Pediat Clin, I-43126 Parma, Italy