1 Experimental Biomedicine and Clinical Neurosciences, School of Medicine, Postgraduate Residency Program in Neurological Surgery, Neurosurgical Clinic, AOUP "Paolo Giaccone", Palermo, Italy.
2 Department of Neurosurgery, Highly Specialized Hospital and of National Importance "Garibaldi", Catania, Italy.
3 Department of Neurosurgery, Highly Specialized Hospital and of National Importance "Garibaldi", Catania, Italy. Electronic address: gfnicoletti@alice.it.
4 Department of Diagnostic Imaging, Interventional Radiology and Neuroradiology, Highly Specialized Hospital and of National Importance "Garibaldi", Catania, Italy.