1. Consultant in Restorative Dentistry, University of Birmingham Dental Hospital and School, St Chad's Queensway, Birmingham B4 6NN, UK
2. Professor of Primary Dental Care and Consultant in Restorative Dentistry, University of Birmingham Dental Hospital and School, St Chad's Queensway, Birmingham B4 6NN, UK
3. Specialist Registrar in Restorative Dentistry, University of Birmingham Dental Hospital and School, St Chad's Queensway, Birmingham B4 6NN, UK