[1] IRCCS Azienda Osped Univ Bologna, Pediat Emergency Unit, I-40138 Bologna, Italy
[2] Univ Bologna, Specialty Sch Paediat, Alma Mater Studiorum, I-40126 Bologna, Italy
[3] Univ Bologna, Dept Med & Surg Sci, Alma Mater Studiorum, I-40126 Bologna, Italy
[4] Azienda Osped Univ Parma, Dept Med & Surg, Pediat Clin, I-43126 Parma, Italy