Links to other studies are more important than ever. One of the most critical needs in behavioural and health sciences is replication of findings across different nations and population groups [118, 119]. We must document the robustness of each finding, and we must also delimit when and where it does not apply. Thus, communication among research teams and harmonisation of data collection and analyses are necessary if we are to translate findings into improved health care. Here we have described the Dunedin Study, and we are currently working to consolidate links with other similar studies, for example, the Christchurch Health and Development and Study in New Zealand and the E-Risk Study in the UK.
