1. Department of Head and Neck Surgery, Neurosurgery Unit, Garibaldi Hospital, Catania, Italy
2. Experimental Biomedicine and Clinical Neurosciences, School of Medicine, Postgraduate, Residency Program in Neurological Surgery, Neurosurgical Clinic, University Hospital “Paolo Giaccone”, Palermo, Italy
3. Breast Surgery Unit, Garibaldi Hospital “Nesima”, Catania, Italy
4. Anesthesiology and Intensive Care Unit, Garibaldi Hospital“Nesima”, Catania, Italy
5. Department of Neurosurgery, Cannizzaro Hospital, Trauma and Gamma Knife Center, Catania, Italy.