Richard M Graham1, Melanie C Sharp2 and G Patrick Ashcroft3
1
Department of Oral and Maxillofacial Surgery, The Royal Preston Hospital, Sharoe Green Road, Fulwood, Preston, Lancashire, PR2 9HT, UK
2
Department of Neurosurgery, Nottingham University Hospitals NHS Trust, Queen's Medical Centre campus, Derby Road, Nottingham, NG7 2UH, UK
3
Department of Orthopaedics, Aberdeen Royal Infirmary, Foresterhill, Aberdeen, AB25 2ZN, UK