Submitted for Publication: June 26, 2013; final revision received August 31, 2013; accepted October 4, 3013.
Published Online: January 29, 2014. doi:10.1001/jamapsychiatry.2013.4174.
Study concept and design: Chang, Lichtenstein, D’Onofrio, Larsson.
Acquisition of data: Lichtenstein, Larsson.
Analysis and interpretation of data: Chang, Lichtenstein, Sjölander.
Drafting of the manuscript: Chang.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Chang, Lichtenstein, Sjölander.
Obtained funding: Lichtenstein, D’Onofrio.
Administrative, technical, or material support: Chang, Lichtenstein, D’Onofrio.
Study supervision: Lichtenstein, Larsson.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported in part by grants 2010-3184 and 2011-2492 from the Swedish Research Council, grant 2006-1625 from the Swedish Council for Working Life and Social Research, and grant HD061817 from the National Institute of Child Health and Human Development.
Role of the Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, or interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.