1. Sir John Walsh Research Institute, Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
2. Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
3. Dunedin Multidisciplinary Health and Development Research Unit, Department of Psychology, Division of Sciences, University of Otago, Dunedin, New Zealand
4. Christchurch Health and Development Study, Psychological Medicine, University of Otago, Christchurch, New Zealand