1. Department of Oral Sciences, Faculty of Dentistry Sir John Walsh Research Institute, 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