1. Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA
2. Department of Neurosurgery, The Walton Centre NHS Foundation Trust, Liverpool, UK
3. Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
4. Department of Neurosurgery, Koc University School of Medicine, Istanbul, Turkey
5. Gamma Knife Center Cairo, Nasser Institute, Cairo, Egypt
6. Department of Neurosurgery, Benha University, Benha, Egypt
7. Department of Neurosurgery, Ain Shams University, Cairo, Egypt
8. Department of Radiation Oncology, National Cancer Institute, Cairo University, Cairo, Egypt
9. Division of Neurosurgery, Centre Hospitalier Université de Sherbrooke, Sherbrooke, Quebec, Canada
10. Department of Neurosurgery, School of Medicine, Neurological Institute, Taipei Veteran General Hospital, Taipei City, Taiwan (ROC)
11. Department of Neurosurgery, National Yang-Ming University, Beitou District, Taipei City, Taiwan (ROC)
12. Department of Radiation and Stereotactic Neurosurgery, Na Homolce Hospital, Prague, Czech Republic
13. Department of Radiosurgery, Rúber International Hospital, Madrid, Spain
14. Department of Neurosurgery, New York University, Cary, North Carolina, USA
15. Department of Neurosurgery and Radiation Oncology, New York University, New York, NY, USA
16. Department of Neurosurgery and Radiotherapy, Nehru Hospital Sector 12, Postgraduate Institute of Medical Education and Research, Chandigarh, Punjab, India
17. Department of Radiology, Dominican Gamma Knife Center and CEDIMAT, Santo Domingo, Dominican Republic
18. Department of Neurosurgery, 2D1.02 Mackenzie Health Sciences Centre, University of Alberta, Edmonton, Alberta, Canada
19. Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, Florida, USA
20. Department of Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA