1. Department of Preventive and Social Medicine, Dunedin School of Medicine,
2. Biostatistics Centre, Division of Health Sciences, and
3. Dunedin Multidisciplinary Health and Development Research Unit, Department of Psychology, University of Otago, Dunedin, New Zealand;
4. Department of Psychology and Neuroscience,
5. Department of Psychiatry and Behavioral Sciences, and
6. Institute for Genome Sciences and Policy, Duke University, Durham, North Carolina; and
7. Department of Medicine, McMaster University, Hamilton, Ontario, Canada