1. Institute of Head and Neck Studies and Education, University of Birmingham, Birmingham, United Kingdom
2. Peter MacCallum Cancer Centre, University of Melbourne, Melbourne, Victoria, Australia
3. Department of Medicine, Medical College of Wisconsin, Milwaukee, WI
4. Radiation Oncology Department, Centre Leon Berard, Lyon, France
5. UPMC Hillman Cancer Center, Pittsburgh, PA
6. Princess Margaret Cancer Centre, University of Toronto, Ontario, Canada
7. Department of Radiation Oncology, Stanford University, Stanford, CA
8. University College London Cancer Institute, London, United Kingdom
9. The University of Texas MD Anderson Cancer Center, Houston, TX
10. Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
11. Department of Head and Neck Medical Oncology, National Cancer Center Hospital East, Chiba, Japan
12. National Kapodistrian University of Athens, Attikon Hospital, Athens, Greece
13. Department of Medical Oncology, Antwerp University Hospital, Edegem, Belgium and Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
14. University of Queensland, and Princess Alexandra Hospital, Brisbane, Queensland, Australia