1. HPV Research Group, Cardiff University, School of Medicine, Cardiff CF14 4XN, UK
2. Ear Nose/Throat/Head and Neck Surgery Department, University Hospital of Wales, Cardiff and Vale University Health Board, Cardiff CF14 4XW, UK
3. Wales Gene Park, Cardiff University, Cardiff CF14 4XN, UK
4. Velindre Cancer Centre, Cardiff CF14 2TL, UK
5. Division of Cancer and Genetics, Cardiff University, School of Medicine, Cardiff CF14 4XN, UK