1. Department of Neurosurgery, Koc University School of Medicine, Istanbul, Turkey;
2. Gamma Knife Center Cairo, Nasser Institute Hospital, Cairo, Egypt;
3. Department of Neurosurgery, Benha University, Qalubya, Egypt;
4. Department of Neurosurgery, Ain Shams University, Cairo, Egypt;
5. Department of Clinical Oncology, Ain Shams University, Cairo, Egypt;
6. Department of Radiation Oncology, National Cancer Institute, Cairo University, Cairo, Egypt;
7. Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA;
8. Department of Neurosurgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India;
9. Department of Radiation Therapy, Postgraduate Institute of Medical Education and Research, Chandigarh, India;
10. Department of Radiation and Stereotactic Neurosurgery, Na Homolce Hospital, Prague, Czech Republic;
11. National Yang Ming Chiao Tung University School of Medicine, Hsinchu, Taiwan;
12. Department of Neurosurgery Neurological Institute, Taipei Veteran General Hospital, Taipei, Taiwan;
13. Radiosurgery Unit, Hospital Ruber Internacional, Madrid, Spain;
14. Department of Neurosurgery, Université de Sherbrooke, Centre de recherche du CHUS, Sherbrooke, Quebec, Canada;
15. Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA;
16. Department of Radiation Oncology, New York University Langone, New York, USA;
17. Department of Neurosurgery, New York University Langone, New York, USA