1 Department of Biomedicine Neurosciences and Advanced Diagnostics, Neurosurgical Clinic, AOUP "Paolo Giaccone", Post Graduate Residency Program in Neurologic Surgery, School of Medicine, University of Palermo, Palermo, Italy. Electronic address: manikon.poullaysilven@unipa.it.
2 Department of Head and Neck Surgery, Neurosurgery Clinic, Garibaldi Hospital, Catania, Italy.
3 Department of Biomedicine Neurosciences and Advanced Diagnostics, Neurosurgical Clinic, AOUP "Paolo Giaccone", Post Graduate Residency Program in Neurologic Surgery, School of Medicine, University of Palermo, Palermo, Italy.