1. Paediatric Department University Hospital Padova Italy
2. Unit of Epidemiology Bambino Gesù Children's Hospital Rome Italy
3. Department of Emergency Medicine University Hospital Padova Italy
4. Department of Emergency Medicine Burlo Garofolo Children's Hospital Trieste Italy
5. Department of Emergency Medicine Bambino Gesù Children's Hospital Rome Italy
6. Research Unit of Perinatal Epidemiology Bambino Gesù Children's Hospital Rome Italy