1. Institute of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Catholic University, 00168 Rome, Italy
2. Neurosurgical Training Center and Brain Research, Mater Olbia Hospital, 07026 Olbia, Italy
3. Department of Neurosurgery, IRCCS Regina Elena National Cancer Institute, 00144 Rome, Italy
4. Department of Neurosurgery, Mater Olbia Hospital, 07026 Olbia, Italy
5. Department of Anatomical Pathology, Giovanni Paolo II Hospital, 97100 Olbia, Italy