[1] North Bristol NHS Trust, Frenchay Hosp, Dept Oral & Maxillofacial Surg, Bristol BS16 1LE, Avon, England
[2] Univ Aberdeen, Sch Med & Dent, Aberdeen AB25 2ZD, Scotland
[3] Queen Alexandra Hosp, Div Oral & Maxillofacial Surg, Portsmouth PO6 3LY, Hants, England
[4] Queen Victoria Hosp NHS Fdn Trust, Dept Maxillofacial Surg, E Grinstead RH19 3DZ, W Sussex, England
[5] Royal Surrey Cty Hosp, Dept Oral & Maxillofacial Surg, Guildford GU2 7XY, Surrey, England
[6] Bradford Teaching Hosp NHS Fdn Trust, St Lukes Hosp, Maxillofacial Unit, Bradford BD5 0NA, W Yorkshire, England
[7] Gloucester Royal Hosp, Dept Oral & Maxillofacial Surg, Gloucester GL1 1NN, England