1. Specialist Registrar in Orthodontics, Charles Clifford Dental Hospital, Sheffield, UK and Royal Derby Hospital, Derby, UK.
2. National Institute for Health Research, Clinical Lecturer, School of Dentistry, University of Manchester, Manchester, UK.
3. Consultant Orthodontist, Chesterfield Royal Hospital NHS Trust, Calow, Chesterfield, UK.
4. Professor of Orthodontics/Honorary Consultant, Unit of Oral Health and Development, University of Sheffield School of Clinical Dentistry, Sheffield, UK.