Accepted for Publication: July 10, 2013.
Published Online: September 23, 2013. doi:10.1001/jamaneurol.2013.4290.
Study concept and design: All authors.
Acquisition of data: All authors.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Veiby.
Critical revision of the manuscript for important intellectual content: Engelsen, Gilhus.
Statistical analysis: Veiby.
Study supervision: Engelsen, Gilhus.
Conflict of Interest Disclosures: Dr Veiby has received travel support from UCB Pharma and lecture fees from GlaxoSmithKline. Dr Engelsen has received travel support from GlaxoSmithKline and lecture fees from Lundbeck. No other disclosures were reported.
Funding/Support: This work was supported by the Norwegian Association for Epilepsy. The Norwegian Mother and Child Cohort Study is supported by the Norwegian Ministry of Health and the Ministry of Education and Research, grant NO1-ES-75558 from the National Institute of Environmental Health Sciences, grants UO1 NS047537-01 and UO1 NS047537-06A1 from the National Institute of Neurological Disorders and Stroke, and grant 151918/S10 from the Norwegian Research Council/FUGE.
Role of the Sponsor: The sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.
Additional Contributions: We are grateful to all the participating families in Norway who take part in this ongoing cohort study. Solveig Glad, MD, PhD, proofread the manuscript.