1 Department of Radiation Oncology, Stanford University School of Medicine, Stanford, California.
2 Department of Radiation Oncology, University of California San Francisco, San Francisco, California.
3 Division of Radiation Oncology, National Cancer Centre Singapore, Singapore.
4 Department of Clinical Oncology, The University of Hong Kong, Hong Kong, China.
5 Department of Oncology, Aarhus University Hospital, Aarhus, Denmark.
6 Center for Molecular Imaging, Oncology and Radiotherapy, Université Catholique de Louvain, Brussels, Belgium; Department of Radiation Oncology, Centre Léon Bérard, Lyon, France.
7 Department of Radiation Oncology, Princess Alexandra Hospital, University of Queensland, Queensland, Australia.
8 Center for Global Health, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
9 Institute of Head and Neck Studies and Education, Department of Head and Neck Surgery, University of Birmingham, Birmingham, United Kingdom.