1. Applied Clinical Research and Public Health, Cardiff University School of Dentistry, Cardiff, UK
2. South East Wales Trials Unit, Centre for Trials Research, Cardiff University, Cardiff, UK
3. DECIPHer, School of Social Sciences, Cardiff University, Cardiff, UK
4. Swansea Centre for Health Economics, College of Human and Health Sciences, Swansea University, Swansea, UK
5. Community Dental Service, Cardiff and Vale University Health Board, Whitchurch Hospital, Cardiff, UK