Accepted for Publication: September 2, 2014.
Published Online: November 10, 2014. doi:10.1001/jamaneurol.2014.3071.
Study concept and design: Balzer.
Acquisition, analysis, or interpretation of data: Nwachuku, Yabes, Habeych, Crammond, Thirumala.
Drafting of the manuscript: Nwachuku, Yabes.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Yabes.
Obtained funding: Nwachuku.
Administrative, technical, or material support: Nwachuku.
Study supervision: Balzer, Habeych, Thirumala.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded by grant 5UL1TR000005 from the National Institutes of Health.
Role of the Funder/Sponsor: The National Institutes of Health 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.