1. Department of Radiation Oncology, The James Cancer Hospital and Solove Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
2. Department of Neurosurgery, The James Cancer Hospital and Solove Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
3. Departments of Radiation Oncology and Neurological Surgery, Mayo Clinic, Jacksonville, Florida, USA
4. Department of Radiation Oncology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
5. Radiation Oncology Consultants LLC, Chicago, Illinois, USA
6. Northwestern Medicine Chicago Proton Center Warrenville, Chicago, Illinois, USA
7. Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
8. Radiation Oncology Unit, UPMC Hillman Cancer Center, San Pietro Hospital FBF, Rome, Italy
9. Department of Radiation Oncology, University of Colorado School of Medicine, Aurora, Colorado, USA
10. Department of Radiation Oncology, Mayo Clinic Scottsdale, Phoenix, Arizona, USA
11. Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, Maryland, USA
12. Department of Radiation Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
13. Department of Medical Oncology, The James Cancer Hospital and Solove Research Institute at The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
14. Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota, USA
15. Department of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
16. Department of Radiation Oncology, Centre Hospitalier de l’ Université de Montreal, Montreal, Quebec, Canada