Liam Masterson1, James O'Mahony2, Matt Lechner3. 1. Department of Pathology, University of Cambridge, Cambridge, CB2 1QP, UK; Department of Otorhinolaryngology, Cambridge University Hospitals NHS Trust, Cambridge, UK. Electronic address: lmm63@cam.ac.uk. 2. Centre for Health Policy and Management, School of Medicine, Trinity College Dublin, Republic of Ireland. 3. UCL Cancer Institute, University College London, London, UK; Head and Neck Centre, University College London Hospitals NHS Trust, London, UK.