1. Department of Surgical, Oncological and Oral Science (Di.Chir.On.S.), University of Palermo, 90100 Palermo, Italy
2. Neurosurgery Unit, Department of Biomedicine, Neurosciences & Advanced Diagnostics (BiND), School of Medicine, University of Palermo, 90127 Palermo, Italy
3. Department of Anesthesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, 90100 Palermo, Italy
4. Department of Radiation Oncology, REM Radioterapia SRL, 95125 Catania, Italy
5. Gamma Knife Center, Trauma Center, Department of Neurosurgery, Cannizzaro Hospital, 95100 Catania, Italy