Submitted for Publication: November 16, 2012; final revision received January 16, 2013; accepted February 20, 2013.
Published Online: September 18, 2013. doi:10.1001/jamapsychiatry.2013.1944.
Study concept and design: Reichborn-Kjennerud, Ystrom, Kendler.
Acquisition of data: Reichborn-Kjennerud, Tambs.
Analysis and interpretation of data: Reichborn-Kjennerud, Ystrom, Neale, Aggen, Mazzeo, Knudsen, Czajkowski, Kendler.
Drafting of the manuscript: Reichborn-Kjennerud, Ystrom.
Critical revision of the manuscript for important intellectual content: Reichborn-Kjennerud, Neale, Aggen, Mazzeo, Knudsen, Tambs, Czajkowski, Kendler.
Statistical analysis: Reichborn-Kjennerud, Ystrom, Neale, Aggen, Czajkowski, Kendler.
Obtained funding: Reichborn-Kjennerud, Tambs, Kendler.
Administrative, technical, and material support: Reichborn-Kjennerud, Knudsen, Tambs.
Study supervision: Reichborn-Kjennerud, Kendler.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported in part by grant MH-068643 from the National Institutes of Health and grants from the Norwegian Research Council, the Norwegian Foundation for Health and Rehabilitation, the Norwegian Council for Mental Health, and the European Commission under the program “Quality of Life and Management of the Living Resources” of the Fifth Framework Program (grant QLG2-CT-2002-01254).
Role of the Sponsor: The funding organizations had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.