1. Primary Dental Care Research Group, University of Birmingham School of Dentistry, The PREP Panel Ltd, Knutsford, Cheshire
2. Panel Ltd, Knutsford, Cheshire
3. General Dental Practitioner, Abingdon, PREP Panel member and part-time Lecturer, University of Birmingham, School of Dentistry, 5 Mill Pool Way, Pebble Mill, Birmingham B5 7EG, UK