1. School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
2. Department of Oral Sciences, University of Otago, Dunedin, New Zealand
3. Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
4. Present address: Research Institute for Innovative Solutions for Well-being and Health (INSIGHT), Faculty of Health, University of Technology Sydney
5. Department of Psychological Medicine, University of Otago Christchurch, Christchurch, New Zealand
6. Department of Psychology, University of Otago, Dunedin, New Zealand