David A. Mitchell, MBBS, BDS, FDSRCPS, FDSRCS (Eng), FRCS (Ed), FRCS (Eng), FRCS (OMFS), consultant oral and maxillofacial/head and neck surgeon, Bradford Teaching Hospitals NHS Foundation Trust, UK; honorary tutor, Faculty of Dental Surgery, Royal College of Surgeons of England, London, UK; Editor, British Journal of Oral and Maxillofacial Surgery Anastasios N. Kanatas, PhD, MD, BSc, PGC, MBBS, BDS, MFDSRCS, MRCS, FRCS (OMFS), consultant oral and maxillofacial/head and neck surgeon, Leeds Teaching Hospitals NHS Trust and associate professor, University of Leeds, UK