1 Section of Neurosurgery, Department of Biomedicine, Neurosciences and Advanced Diagnostics (BiND), University of Palermo, Palermo, Italy. Electronic address: giovanni.grasso@unipa.it.
2 Department of Neurosensory and Motor Surgery, University of Palermo, Palermo, Italy.
3 Section of Neurosurgery, Department of Biomedicine, Neurosciences and Advanced Diagnostics (BiND), University of Palermo, Palermo, Italy.