Adel K El-Naggar1
, Colin Hopper2,3,4
, Tahwinder Upile3,4,5
and Waseem Jerjes2,3,4 
1
Head and Neck Pathology, Division of Pathology, UT. M.D. Anderson Cancer Center, Texas, USA
2
Head & Neck Centre, University College London Hospitals, London, UK
3
Unit of Oral & Maxillofacial Surgery, Division of Maxillofacial, Diagnostic, Medical and Surgical Sciences, UCL Eastman Dental Institute, London, UK
4
Department of Surgery, University College London Medical School, London, UK
5
Department of Head & Neck Surgery, the Professorial Unit, the Royal National Throat, Nose and Ear Hospital, London, UK