1. Department of Neurosurgery, University of Virginia, Charlottesville, Virginia;
2. Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
3. Gamma Knife Center Cairo, Nasser Institute Hospital, Cairo, Egypt;
4. Neurosurgery Department, Benha University, Qalubya, Egypt;
5. Neurosurgery Department, Ain Shams University, Cairo, Egypt;
6. Clinical Oncology Department, Ain Shams University, Cairo, Egypt;
7. Radiation Oncology Department, National Cancer Institute, Cairo University, Egypt;
8. Stereotactic and Radiation Neurosurgery Department, Na Homolce Hospital, Prague, Czech Republic;
9. Department of Neurosurgery, Université de Sherbrooke, Centre de recherche du CHUS, Sherbrooke, Quebec, Canada;
10. Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan;
11. School of Medicine, National Yang-Ming University, Taipei, Taiwan;
12. Department of Neurosurgery, Humanitas Clinical and Research Center—IRCCS, Rozzano, Italy;
13. Centro Gamma Knife Dominicano and CEDIMAT Radiology Department, Santo Domingo, Dominican Republic;
14. Division of Radiation Oncology, Department of Oncology, University of Alberta, Edmonton, Canada;
15. Department of Neurosurgery, West Virginia University, Morgantown, West Virginia;
16. Department of Radiation Oncology, West Virginia University, Morgantown, West Virginia;
17. Department of Neurosurgery, University of Southern California, Los Angeles, California;
18. Department of Radiation Oncology, University of Southern California, Los Angeles, California;
19. Department of Radiation Oncology, University of Colorado, Aurora, Colorado;
20. Gamma Knife Center, Jewish Hospital, Mayfield Clinic, Cincinnati, Ohio; and