Affiliation: | 1. Brighton and Sussex Medical School, Division of Primary Care and Public Health, , Brighton, UK;2. Guy's and St Thomas' Hospitals NHS Trust, Department of Oral and Maxillofacial Surgery, Guy's Hospital, , London, UK;3. Institute of Psychiatry, Department of Psychology, King's College London, Guy's Hospital, , London, UK;4. Brighton and Sussex University Hospitals NHS Trust, Department of Oral and Maxillofacial Surgery, The Royal Sussex County Hospital, , Brighton, UK |