1 Professor/ Consultant in Restorative Dentistry, University Dental School & Hospital/ University College Cork, Wilton, Cork, Ireland.
2 Senior Lecturer in Medical Statistics, School of Dentistry, Heath Park, Cardiff, CF14 4XY, United Kingdom.
3 Research Associate, Centre for Trials Research, College of Biomedical and Life Sciences, Cardiff University, Heath Park, Cardiff, CF144YS, United Kingdom.
4 Professor and Honorary Consultant in Dental Public Health, School of Dentistry, Heath Park, Cardiff, CF14 4XY, United Kingdom.
5 Dean, Faculty of Dentistry, University of Otago, Dunedin, New Zealand.
6 Emeritus Professor of Dentistry, King's College London Dental Institute, London, United Kingdom.