1. Department of Radiation Oncology, REM Radioterapia srl, Viagrande, Catania, Italy;
2. Department of Neurosurgery, University of Cincinnati, Ohio;
3. Department of Neurosurgery, Highly Specialized Hospital of National Importance "Garibaldi," Catania, Italy;
4. Texas A&M University College of Medicine, Houston, Texas;
5. King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia;
6. Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Dallas, Texas;
7. Department of Neurosurgery, Cankiri State Hospital, Cankiri, Turkey;
8. Department of Neurosurgery, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India;
9. Division of Neurosurgery, Health Sciences North, Northern Ontario School of Medicine, Sudbury, Ontario, Canada;
10. Department of Neurosurgery, University of Texas Southwestern Medical Center, Dallas, Texas; and
11. Department of Neurosurgery, Trauma Center, Gamma Knife Center, Cannizzaro Hospital, Catania, Italy