1Head & Neck Centre, University College London Hospital, London, UK,
2Head and Neck Department, Charing Cross Hospital, London, UK,
3The Royal National Throat, Nose and Ear Hospital, 330/332 Grays' Inn Road, London, WC1X 8EE, UK
4Department of Oral Surgery and Radiology, School of Dentistry, Aristotle University, Thessaloniki, Greece,
5Department of Otolaryngology, Bielefeld University, Bielefeld, Germany
6Department of Histopathology, Imperial College & Charing Cross Hospital, London, UK and