Submitted for Publication: November 22, 2013; final revision received February 17, 2014; accepted April 21, 2014.
Published Online: September 3, 2014. doi:10.1001/jamapsychiatry.2014.1011.
Study concept and design: Meier, Pedersen, Arendt.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Meier, Arendt.
Critical revision of the manuscript for important intellectual content: Petersen, Pedersen, Arendt, Nielsen, Mattheisen, Mors, Mortensen.
Statistical analysis: Meier.
Obtained funding: Mortensen.
Administrative, technical, or material support: Mattheisen.
Study supervision: Petersen, Nielsen, Mattheisen, Mors, Mortensen.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by the Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH. Dr Mortensen was supported by the Stanley Medical Research Institute.
Role of the Funder/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.