1. Department of Radiation Oncology University of Florida College of Medicine Gainesville Florida USA
2. University of Florida Health Proton Therapy Institute Jacksonville Florida USA
3. Department of Radiation Oncology University of Colorado Denver Denver Colorado USA
4. Department of Radiation Medicine and Applied Science University of California San Diego La Jolla California USA
5. Columbus Ohio USA
6. Department of Radiation Oncology Mayo Clinic Arizona Phoenix Arizona USA
7. Department of Radiation Oncology Princess Margaret Cancer Centre Toronto Ontario Canada
8. Department of Radiation Oncology University of Vermont Medical Center Burlington Vermont USA
9. Department of Radiation Oncology MD Anderson Cancer Center Houston Texas USA
10. Atrium Health Wake Forest Baptist High Point Medical Center High Point North Carolina USA