1. Orthopedics and Traumatology Unit, Emergency and Urgency Department, A.S.S.T. Grande Ospedale Metropolitano Niguarda, Milan, Italy
2. Neurosurgery Unit, Emergency and Urgency Department, A.S.S.T. Grande Ospedale Metropolitano Niguarda, Milan, Italy
3. Università Degli Studi di Milano, Milan, Italy