Submitted for Publication: October 31, 2013; final revision received March 25, 2014; accepted March 27, 2014.
Published Online: July 16, 2014. doi:
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: Fergusson, Horwood, Boden.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: Fergusson, Boden, Mulder.
Statistical analysis: Fergusson, Horwood.
Obtained funding: All authors.
Conflict of Interest Disclosures: None reported.
Funding/Support: This research was funded by grants from the Health Research Council of New Zealand, the National Child Health Research Foundation (Cure Kids), the Canterbury Medical Research Foundation, and the New Zealand Lottery Grants Board.
Role of the Sponsor: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.