1. Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
2. Department of Preventive and Social Medicine, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
3. Unit of Dental Public Health, School of Clinical Dentistry, University of Sheffield, Sheffield, UK
4. Department of Psychology, University of Otago, Dunedin, New Zealand