1. Bangor University; North Wales Organisation for Randomised Trials in Health; Y Wern (Normal Site) Holyhead Road Bangor UK LL57 2PZ
2. Bangor University; School of Healthcare Sciences; Fron Heulog Bangor UK
3. University of Manchester; Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health; Manchester UK
4. Queen's University Belfast; Centre for Public Health; Belfast Northern Ireland UK
5. University College London; London UK
6. Cardiff University Dental School; Applied Clinical Research and Public Health; Heath Park Cardiff UK CF14 4XY
7. The University of Manchester; The Dental Health Unit; Williams House Lloyd Street North Manchester UK M15 6SE
8. Newcastle University; Restorative Dentistry School of Dental Sciences; Framlington Place NE2 4BW Newcastle Upon Tyne UK
9. University of Applied Sciences Utrecht; Research Centre Innovations in Healthcare; Bolognalaan 101 Utrecht Netherlands 3584 CJ
10. University College Cork; Dental School & Hospital; Cork Ireland
11. University College London; Department of Epidemiology & Public Health; 1-19 Torrington Place London UK WC1E 7HB
12. University of Bangor; Centre for Health-Related Research; Fron Heulog Bangor Wales UK