1. Pediatric Emergency Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
2. Specialty School of Paediatrics, Alma Mater Studiorum, University of Bologna, 40126 Bologna, Italy
3. Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, 40126 Bologna, Italy
4. Pediatric Clinic, Department of Medicine and Surgery, Azienda Ospedaliero-Universitaria of Parma, 43126 Parma, Italy