1. Institute of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, Rome, Italy
2. Department of Neurosurgery, Mater Olbia Hospital, Olbia, Italy
3. Unit of Radiology, Mater Olbia Hospital, Olbia, Italy
4. Institute of Orthopedics, Fondazione Policlinico Universitario Agostino Gemelli IRCSS, Catholic University of Rome, Rome, Italy
5. Unit of Orthopedics, Mater Olbia Hospital, Olbia, Italy