1. General Dental Practitioner and Clinical Lecturer, Primary Dental Care Research Group, University of Birmingham School of Dentistry, St Chad's Queensway, Birmingham B4 6NN, UK
2. Reader in Restorative Dentistry, Primary Dental Care Research Group, University of Birmingham School of Dentistry, St Chad's Queensway, Birmingham B4 6NN, UK
3. Professor of Primary Dental Care, Primary Dental Care Research Group, University of Birmingham School of Dentistry, St Chad's Queensway, Birmingham B4 6NN, UK