1. Specialist Registrar in Restorative Dentistry, Liverpool Dental Hospital, The University of Queensland, Australia
2. Orthodontic Registrar, The University of Queensland, Australia
3. Consultant in Oral Rehabilitation, Regional Maxillofacial Unit, Aintree Hospital and Liverpool Dental Hospital
4. Consultant Oral and Maxillofacial Surgeon, Liverpool University Dental School and Evidence-Based Practice Research Centre (EPRC), Faculty of Health, Edge Hill University, St Helens Road, Ormskirk, L39 4QP, UK