1. Neurosurgery Clinic, Department of Head and Neck Surgery Garibaldi Hospital Catania Italy
2. Department of Nursing Service Garibaldi Hospital Catania Italy
3. Microbiology Section, Department of Biomedical and Biotechnological Sciences University of Catania Catania Italy
4. Department of Neurosurgery Neurosurgery Clinic Birgunj Nepal
5. Department of Neurosurgery, Trauma and Gamma Knife Center Cannizzaro Hospital Catania Italy
6. Department of Medicine and Surgery Kore University of Enna Enna Italy