Accepted for Publication: April 8, 2015.
Published Online: June 1, 2015. doi:10.1001/jamaneurol.2015.0910.
Study concept and design: Kioumourtzoglou, Gredal, Hansen, Weisskopf.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Kioumourtzoglou, Rotem, Weisskopf.
Critical revision of the manuscript for important intellectual content: Seals, Gredal, Hansen, Weisskopf.
Statistical analysis: Kioumourtzoglou, Seals, Weisskopf.
Obtained funding: Hansen, Weisskopf.
Administrative, technical, or material support: Kioumourtzoglou, Gredal, Hansen.
Study supervision: Weisskopf.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by grant 5R01 ES019188-02 from the National Institute of Environmental Health Sciences. Dr Kioumourtzoglou and Mr Seals are supported in part by training grant T32 ES007069 from the National Institutes of Health. Mr Seals is also supported in part by the Taplin Fellowship.
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.
Additional Contributions: Alessandro Doria, MD, PhD, Department of Epidemiology, Harvard T. H. Chan School of Public Health and Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, provided critical review of an earlier version of the manuscript; he received no compensation.