1 Department of Neurosurgery, Mater Olbia Hospital, Olbia, Italy.
2 Institute of Neurosurgery, Istituto di Ricovero e Cura a Carattere Scientifico Fondazione Policlinico Universitario Agostino Gemelli, Catholic University, Rome, Italy.
3 Neurosurgical Training Center and Brain Research - Mater Olbia Hospital, Olbia, Italy.
4 Unit of Radiology, Mater Olbia Hospital, Olbia, Italy.