1. Department of Radiation Oncology University of Alabama at Birmingham O'Neal Comprehensive Cancer Center Birmingham Alabama USA
2. Institute for Cancer Outcomes and Survivorship University of Alabama at Birmingham Birmingham Alabama USA
3. Statistics and Data Management Department NRG Oncology Philadelphia Pennsylvania USA
4. Statistical and Data Management Department American College of Radiology Philadelphia Pennsylvania USA
5. School of Medicine University of Alabama at Birmingham Birmingham Alabama USA
6. Department of Radiation Oncology Washington University School of Medicine Saint Louis Missouri USA
7. Radiation Oncology Department of Radiation Oncology Edmonton Cross Cancer Institute Edmonton Alberta Canada
8. Department of Radio Oncology CHUM ‐ Centre Hospitalier de l'Universite de Montreal Montreal Quebec Canada
9. Radiation Oncology Thomas Jefferson University Hospital Philadelphia Pennsylvania USA
10. Department of Radiation Oncology UCSF Medical Center‐Mount Zion San Francisco California USA
11. Department of Radiation Oncology University of Michigan Comprehensive Cancer Center Ann Arbor Michigan USA
12. Department of Radiation Oncology University of Maryland/Greenebaum Cancer Center Baltimore Maryland USA
13. Department of Radiation Oncology University of California Davis Sacramento California USA
14. Department of Oncology Tom Baker Cancer Centre Calgary Alberta Canada
15. The Research Institute McGill University Health Centre (MUHC) Montreal Quebec Canada
16. Department of Oncology London Regional Cancer Program London Ontario Canada
17. Department of Radiation Oncology University of Rochester Rochester New York USA
18. Department of Radiation Oncology Summa Health System ‐ Akron Campus Akron Ohio USA
19. Department of Radiation Oncology UCSF Medical Center‐Mission Bay San Francisco California USA
20. Department of Radiation Oncology Cedars‐Sinai Medical Center Los Angeles California USA