1 Department of Neurosurgery, Cannizzaro Hospital, Trauma Center, Gamma Knife Center, Catania, Italy. Electronic address: umana.nch@gmail.com.
2 Department of Neurosurgery, Cannizzaro Hospital, Trauma Center, Gamma Knife Center, Catania, Italy.
3 Department of Neurosurgery, Highly Specialized Hospital of National Importance "Garibaldi", Catania, Italy.
4 Department of Neurosurgery, Highly Specialized Hospital of National Importance "Garibaldi", Catania, Italy; Division of Neurosurgery, Department of Biomedical and Dental Sciences and Morpho-Functional Imaging, University of Messina, Italy.