1. Department of 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 of National Importance “Garibaldi”, Catania, Italy.
3. Department of Neurosurgery, Cannizzaro Hospital, Trauma Center, Gamma Knife Center, Catania, Italy.
4. Department of Onco-hematology, Highly Specialized Hospital of National Importance “Garibaldi”, Catania, Italy.