Accepted for Publication: June 12, 2013.
Published Online: August 26, 2013. doi:10.1001/jamaneurol.2013.3835.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: All authors.
Obtained funding: Eliasmith.
Administrative, technical, and material support: All authors.
Study supervision: Eliasmith.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by funding from the Natural Sciences and Engineering Research Council of Canada, Canada Research Chairs, The Canadian Foundation for Innovation, and Ontario Innovation Trust.
Additional Information: Portions of the work described herein are covered under Canadian Patent Application 2798529 and US Provisional Patent Application 61/733771.