1. Institute of Head and Neck Studies and Education, School of Cancer Sciences, University of Birmingham Edgbaston Birmingham UK
2. King's Clinical Trials Unit (KCTU) Institute of Psychology, Psychiatry and Neuroscience, King's College London De Crespigny Park London UK
3. Department of Biostatistics and Health Informatics Institute of Psychology, Psychiatry and Neuroscience, King's College London De Crespigny Park London UK
4. Hall‐Edwards Radiotherapy Research Group University Hospitals Birmingham Edgbaston Birmingham UK
5. University Hospitals Coventry and Warwickshire Clifford Bridge Road Coventry UK
6. Velindre Cancer Centre Velindre Road Cardiff UK
7. Liverpool Head and Neck Centre University of Liverpool Liverpool UK
8. Department of Oral and Maxillofacial Surgery Wirral University Teaching Hospital Wirral UK
9. Auckland University Auckland New Zealand