Accepted for Publication: March 2, 2016.
Published Online: May 16, 2016. doi:10.1001/jamaneurol.2016.0800.
Study concept and design: Beckham, Pastula, Tyler.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Beckham, Tyler.
Critical revision of the manuscript for important intellectual content: All authors.
Administrative, technical, or material support: Beckham, Pastula.
Study supervision: Beckham, Tyler.
Conflict of Interest Disclosures: None reported.