1 Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, Unit of Neurosurgery, University of Brescia, Brescia, Italy.
2 Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, Unit of Neurosurgery, University of Brescia, Brescia, Italy. Electronic address: luciodemaria@libero.it.
3 Department of Neuroscience, Unit of Neurosurgery, Catholic University of the Sacred Heart, Rome, Italy.