Accepted for Publication: August 21, 2014.
Published Online: December 22, 2014. doi:10.1001/jamaneurol.2014.2927.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: Stenudd, Sabelström.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: All authors.
Obtained funding: Frisén.
Administrative, technical, or material support: All authors.
Study supervision: Frisén.
Conflict of Interest Disclosures: None reported.
Funding/Support: Work in the authors’ laboratory was supported by grants from the Swedish Research Council, the Swedish Cancer Society, the Karolinska Institute, Tobias Stiftelsen, AFA Försäkringar, the Strategic Research Programme in Stem Cells and Regenerative Medicine at Karolinska Institutet (StratRegen), Torsten Söderbergs Stiftelse, and Knut och Alice Wallenbergs Stiftelse.
Role of the Funder/Sponsor: The funding sources 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.