[1] Azienda Sanit Locale Romagna, Infermi Hosp Rimini, Dept Pediat, Rimini, Italy
[2] Great Romagna Area Hub Lab, Unit Microbiol, Pievesestina Di Cesena, Italy
[3] Santa Maria Croci Hosp, Dept Pediat, Ravenna, Italy
[4] Azienda Sanit Locale Romagna, Dept Pediat, Forli, Italy
[5] Azienda Sanit Locale Romagna, Pediat Clin, Cesena, Italy
[6] Guglielmo da Saliceto Hosp, Pediat & Neonatol Unit, Piacenza, Italy
[7] Univ Bologna, Policlin St Crsola, Gen & Emergency Pediat, Bologna, Italy
[8] Pietro Barilla Childrens Hosp, Gen & Emergency Pediat, Parma, Italy
[9] Azienda Sanit Locale Romagna, Pediat Community Unit, Rimini, Italy
[10] Azienda Sanit Locale Romagna, Pediat Community Unit, Ravenna, Italy
[11] Univ Parma, Dept Med & Surg, Lab Hyg & Publ Hlth, Parma, Italy
[12] Univ Bologna, Pollclin St Orsola, Microbiol Unit, Bologna, Italy
[13] Univ Parma, Pietro Barilla Childrens Hosp, Pediat Clin, Parma, Italy