1. Department of Otolaryngology- Head and Neck Surgery; The Newcastle upon Tyne Hospitals NHS Foundation Trust; Newcastle upon Tyne United Kingdom
2. Department of Otolaryngology- Head and Neck Surgery; Nottingham University Hospitals NHS Trust; Nottingham United Kingdom
3. Department of Medical Physics; The Newcastle upon Tyne Hospitals NHS Foundation Trust; Newcastle upon Tyne United Kingdom
4. School of Cancer Sciences and Institute of Head and Neck Studies and Education; University of Birmingham; Birmingham United Kingdom
5. Liverpool CR-UK Centre; Department of Molecular and Clinical Cancer Medicine; University of Liverpool; United Kingdom