Submitted for Publication: July 9, 2014; final revision received November 18, 2014; accepted November 19, 2014.
Published Online: March 4, 2015. doi:10.1001/jamapsychiatry.2014.3028.
Study concept and design: Colvert, Tick, Ronald, Plomin, Rijsdijk, Happé, Bolton.
Acquisition, analysis, or interpretation of data: Colvert, Tick, McEwen, Stewart, Curran, Woodhouse, Gillan, Hallett, Lietz, Garnett, Ronald, Happé, Bolton.
Drafting of the manuscript: Colvert, Tick, McEwen, Curran, Rijsdijk, Happé, Bolton.
Critical revision of the manuscript for important intellectual content: Colvert, Tick, McEwen, Stewart, Woodhouse, Gillan, Hallett, Lietz, Garnett, Ronald, Plomin, Rijsdijk, Happé, Bolton.
Statistical analysis: Colvert, Tick, Ronald, Rijsdijk, Bolton.
Obtained funding: Plomin, Happé, Bolton.
Administrative, technical, or material support: Colvert, McEwen, Stewart, Woodhouse, Gillan, Garnett, Ronald.
Study supervision: Curran, Rijsdijk, Happé, Bolton.
Conflict of Interest Disclosures: None reported.
Funding/Support: The Twins Early Development Study (TEDS) is supported by program grant G0901245 (previously G0500079) from the UK Medical Research Council (MRC). The Social Relationship Study was supported by grant G0500870 from the MRC. This study is also supported by 1+3 PhD studentship MR/J500380/1 from the MRC (Ms Tick), by a senior investigator award from the National Institute for Health Research (Dr Bolton), by the Biomedical Research Centre in Mental Health at the South London and Maudsley NHS Trust (Dr Bolton), and by an Autism Speaks grant (Dr Bolton).
Role of the Funder/Sponsor: The funding source 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.
Additional Contributions: We thank the TEDS participants and their families for their ongoing contribution.