1. Department of Otolaryngology – Head & Neck Surgery Johns Hopkins University Baltimore Maryland USA
2. NRG Oncology Statistics and Data Management Center American College of Radiology Philadelphia Pennsylvania USA
3. The University of Texas M. D. Anderson Cancer Center Houston Texas USA
4. Department of Radiation Oncology Centre Hospitalier de l'Universite de Montreal Montreal Quebec Canada
5. Department of Hematology and Oncology Lehigh Valley Hospital Allentown Pennsylvania USA
6. Department of Surgical Oncology Fox Chase Cancer Center Philadelphia Pennsylvania USA
7. H. Lee Moffitt Cancer Center and Research Institute Tampa Florida USA
8. Intermountain Medical Center St. George Utah USA
9. Department of Oncology Summa Health System – Akron Campus Akron Ohio USA
10. Department of Radiation Oncology The Research Institute of the McGill University Health Centre (MUHC) Montreal Quebec Canada
11. Department of Medical Oncology University of Alabama at Birmingham Cancer Center Birmingham Alabama USA
12. Department of Radiation Oncology University of Rochester Rochester New York USA
13. Department of Radiation Oncology Stanford University Stanford California USA