1. Department of Otolaryngology‐Head and Neck Surgery Johns Hopkins University, School of Medicine Baltimore Maryland
2. NRG Oncology Statistics and Data Management Center American College of Radiology Philadelphia Pennsylvania
3. The University of Texas MD Anderson Cancer Center Houston Texas
4. University Hospital of Montreal Montreal Quebec Canada
5. H. Lee Moffitt Cancer Center and Research Institute Tampa Florida
6. University of Cincinnati Cancer Institute Cincinnati Ohio
7. Washington University St. Louis Missouri
8. University of California at San Francisco San Francisco California
9. Medical College of Wisconsin Milwaukee Wisconsin
10. Fox Chase Cancer Center Philadelphia Pennsylvania
11. University of California at Davis Davis California
12. University of Alabama at Birmingham Medical Center Birmingham Alabama
13. L’Hotel‐Dieu de Quebec Quebec City Quebec Canada
14. University of Colorado Aurora Colorado
15. Stanford University Stanford California