[1] Univ Padua, Div Pediat Infect Dis, Padua, Italy
[2] Univ Padua, Dept Woman & Child Hlth, Pediat Emergency Dept, Via Giustiniani 3, I-35141 Padua, Italy
[3] Anna Meyer Childrens Univ Hosp, Pediat Infect Dis Unit, Florence, Italy
[4] Univ Florence, Dept Hlth Sci, Florence, Italy
[5] Bambino Gesu Pediat Hosp, Univ Dept Pediat, Unit Immune & Infect Dis, Rome, Italy
[6] Bambino Gesu Pediat Hosp, Res Inst, Unit Otolaryngol Head & Neck Surg, Rome, Italy
[7] S Maria Ca Foncello, Div Pediat, Treviso, Italy
[8] Univ Padua, Dept Neurosci, Sect Otolaryngol, Padua, Italy
[9] Reg Ctr Head & Neck Canc, Treviso, Italy
[10] Univ Padua, Biostat Epidemiol & Publ Hlth Unit, Dept Cardiac Thorac & Vasc Sci, Padua, Italy
[11] Univ Padua, Dept Otolaryngol & Endoscop Surg Upper Airways, Padua, Italy