1. Neurosurgical Clinic, AOUP “Paolo Giaccone”, Post Graduate Residency Program in Neurologic Surgery, Department of Biomedicine Neurosciences and Advanced Diagnostics, School of Medicine, University of Palermo, 90127 Palermo, Italy
2. Neurosurgery Unit, Department of Head and Neck Surgery, Garibaldi Hospital, 95122 Catania, Italy