Accepted for Publication: July 24, 2013.
Published Online: December 23, 2013. doi:10.1001/jamaneurol.2013.4528.
Study concept and design: All authors.
Acquisition of data: All authors.
Analysis and interpretation of data: Rebeiz, Ardelt.
Drafting of the manuscript: Rebeiz, Ardelt.
Critical revision of the manuscript for important intellectual content: All authors.
Study supervision: All authors.
Conflict of Interest Disclosures: None reported.