1. University of Colorado School of Medicine, Department of Radiation Oncology, Aurora
2. Katsuta Hospital Mito Gamma House, Hitachi-naka, Japan
3. Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
4. University of Colorado Cancer Center, Biostatistics Core, Aurora
5. Tokyo Gamma Unit Center, Tsukiji Neurological Clinic, Tokyo, Japan
6. Aizawa Comprehensive Cancer Center, Division of Radiation Oncology, Aizawa Hospital, Matsumoto, Japan
7. Chiba University Graduate School of Medicine, Department of Neurological Surgery, Chiba, Japan
8. Yokohama Rosai Hospital, Department of Neurosurgery, Yokohama, Japan
9. Gamma Knife Center, NTT Medical Center Tokyo, Tokyo, Japan
10. Department of Preventive Medicine and Public Health, Keio University School of Medicine, Tokyo, Japan
11. Department of Neurological Surgery and Radiation Oncology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
12. Department of Neurosurgery, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania
13. Department of Neurosurgery, Yale University School of Medicine, New Haven, Connecticut
14. Department of Radiation Oncology, University of California, San Francisco, San Francisco
15. Division of Neurosurgery, Université de Sherbrooke, Centre de Recherche du CHUS, Sherbrooke, Quebec, Canada
16. Taipei Veterans General Hospital, Department of Neurosurgery, Neurological Institute, Taipei, Taiwan
17. Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
18. Department of Radiation Oncology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
19. Department of Neurosurgery, New York University Langone Medical Center, New York
20. Department of Radiation Oncology, Beaumont Health System, Royal Oak, Michigan
21. Department of Neurological Surgery, University of Virginia, Charlottesville
22. National Hospital Organization Kyushu Cancer Center, Department of Thoracic Oncology, Fukuoka, Japan
23. Department of Radiation Oncology, Emory University, Atlanta, Georgia
24. Department of Radiation Oncology, Allegheny General Hospital, Pittsburgh, Pennsylvania
25. Department of Radiation Oncology, University of Washington School of Medicine, Seattle
26. Department of Neurosurgery, Jewish Hospital–Mercy Health, Cincinnati, Ohio
27. Department of Radiation Oncology, Mayo Clinic Jacksonville, Jacksonville, Florida
28. Department of Radiation Oncology, Ohio State University, Columbus
29. Department of Radiation Oncology, Vanderbilt University, Nashville, Tennessee
30. Department of Neurosurgery, West Virginia University, Morgantown
31. Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota
32. Department of Radiation Oncology, Technical University of Munich, Munich, Germany
33. Department of Radiation Oncology, University of Alberta, Edmonton, Alberta, Canada
34. Department of Radiation Oncology, University Hospital Zurich, The University of Zurich, Zurich, Switzerland