1 Section of Neurosurgery, Department of Neuroscience, University of Turin, Turin, Italy.
2 Department of Neurosurgery, Maggiore Della Carità University Hospital, Novara, Italy.
3 Division of Neurosurgery, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Brescia, Italy.
4 Department of Neurosurgery, ASST Santi Paolo e Carlo, Milano, Italy.
5 Department of Neuroradiology, ASST Santi Paolo e Carlo, Milano, Italy.