1. Dana-Farber Cancer Institute, Boston, MA;
2. University of Pittsburgh Cancer Institute, Pittsburgh, PA;
3. The University of Texas MD Anderson Cancer Center, Houston, TX;
4. University of Pennsylvania, Philadelphia, PA;
5. The Johns Hopkins University, Baltimore, MD;
6. Fox Chase Cancer Center, Philadelphia, PA;
7. Mayo Clinic, Rochester, MN;
8. Johns Hopkins University School of Medicine, Baltimore, MD;
9. The Ohio State University Comprehensive Cancer Center, Columbus, OH;
10. Northwestern University Feinberg School of Medicine, Chicago, IL;
11. Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, ON, Canada;
12. University of Washington, Seattle, WA;
13. Florida Hospital Orlando, Orlando, FL;
14. Providence Cancer Center, Portland, OR;
15. UNMC College of Medicine, Department of Otolaryngology/Head & Neck Surgery, Omaha, NE;
16. University of Miami, Miami, FL;
17. Yale University-Yale Cancer Center, New Haven, CT;