1. Department of Head and Neck Surgery, Neurosurgery Unit, Garibaldi Hospital, Catania, Italy
2. Department of Experimental Biomedicine and Clinical Neurosciences, School of Medicine, Postgraduate Residency Program in Neurological Surgery, Neurosurgical Clinic, AOUP “Paolo Giaccone”, Palermo, Italy
3. Department of Radiology, ARNAS Garibaldi, Catania, Italy
4. Department of Neurosurgery, Cannizzaro Hospital, Catania, Italy.