Accepted for Publication: March 28, 2013.
Published Online: July 1, 2013. doi:10.1001/jamaneurol.2013.3022.
Acquisition of data: Walczak, Siger, Ciach, and Selmaj.
Analysis and interpretation of data: Walczak, Siger, and Selmaj.
Drafting of the manuscript: Walczak, Siger, Ciach, and Selmaj.
Critical revision of the manuscript for important intellectual content: Szczepanik and Selmaj.
Statistical analysis: Walczak, Siger, and Selmaj.
Obtained funding: Szczepanik and Selmaj.
Administrative, technical, and material support: Walczak and Ciach.
Study supervision: Selmaj.
Conflict of Interest Disclosures: Dr Selmaj has served on scientific advisory boards for Novartis, Biogen Idec, ONO Pharma, Genzyme, Roche, Synthon, and Teva and has received payment for lectures for Novartis, Biogen Idec, ONO Pharma, and Merck Serono. Dr Walczak has received consulting fees from Novartis.
Additional Contributions: We thank Celia Brosnan, PhD, Albert Einstein College of Medicine, Bronx, New York, for helpful advice and editing the manuscript.