[1] Univ Parma, Univ Hosp, Dept Med & Surg, Pediat Clin, I-43126 Parma, Italy
[2] Guglielmo da Saliceto Hosp, Ophthalmol Unit, I-29121 Piacenza, Italy
[3] Azienda Osped Univ Integrata, Pediat Clin, I-37134 Verona, Italy
[4] Univ Hosp Parma, Clin & Epidemiol Res Unit, I-43126 Parma, Italy
[5] Fdn Policlin Univ A Gemelli IRCCS, Pediat ICU & Trauma Ctr, I-00165 Rome, Italy
[6] IRCCS Bambino Gesu Childrens Hosp, Acad Dept Pediat, Paediat & Infect Dis Unit, I-00165 Rome, Italy
[7] Univ Padua, Dept Woman & Child Hlth, Div Paediat Infect Dis, I-35100 Padua, Italy
[8] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, I-80138 Naples, Italy
[9] Azienda Osped Univ Integrata, Ophthalmol Unit, I-37134 Verona, Italy
[10] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Mother Child & Infant, NICU, I-20122 Milan, Italy
[11] Univ Milan, I-20122 Milan, Italy
[12] Salesi Childrens Hosp, Pediat Anesthesia & Intens Care Unit, I-60123 Ancona, Italy
[13] Meyer Childrens Hosp, Pediat Infect Dis Unit, I-50139 Florence, Italy
[14] Carones Vis Advalia, I-20145 Milan, Italy