Submitted for Publication: July 5, 2013; final revision received August 29, 2013; accepted October 2, 2013.
Published Online: January 22, 2014. doi:10.1001/jamapsychiatry.2013.4081.
Study concept and design: McGrath, Petersen, Agerbo, Pedersen.
Acquisition of data: Mortensen, Pedersen.
Analysis and interpretation of data: McGrath, Agerbo, Mors, Pedersen.
Drafting of the manuscript: McGrath, Pedersen.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: McGrath, Agerbo, Pedersen.
Obtained funding: McGrath, Mortensen.
Administrative, technical, or material support: Mortensen.
Conflicts of Interest Disclosures: None reported.
Funding/Support: This study was supported by the John Cade Fellowship 1056929 from the Australian National Health and Medical Research Council (Dr McGrath), by the Stanley Medical Research Institute, and by grants from The Lundbeck Foundation.
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.
Additional Contributions: Aksel Bertelsen, MD, Aarhus University Hospital, Risskov, Denmark, assisted with the diagnostic classification.
Correction: This article was corrected on January 22, 2014, to fix the key in Figure 3.