[1] Univ Hosp Birmingham NHS Fdn Trust, Birmingham, W Midlands, England
[2] Queen Alexandra Hosp, Maxillofacial Unit, Portsmouth, Hants, England
[3] Univ Birmingham, Coll Med & Dent Sci, Birmingham, W Midlands, England
[4] Edge Hill Univ, Fac Hlth Social Care & Med, Ormskirk, England