1 Department of Clinical Oncology, Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, United Kingdom. Electronic address: [email protected].
2 Department of Clinical Oncology, Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, United Kingdom.
3 Department of Clinical Oncology, Derriford Hospital, Plymouth, United Kingdom.
4 Department of Physics, Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, United Kingdom.
5 Head and Neck surgery, The Royal Marsden NHS Foundation Trust, London, United Kingdom.