Accepted for Publication: February 14, 2013.
Published Online: May 20, 2013. doi: 10.1001/jamaneurol.2013.420
Acquisition of data: Guiot and Chertkow.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Ducharme, Guiot, and Chertkow.
Critical revision of the manuscript for important intellectual content: Guiot, Nikelski, and Chertkow.
Statistical analysis: Nikelski.
Obtained funding: Chertkow.
Administrative, technical, and material support: Guiot.
Study supervision: Chertkow.
Conflict of Interest Disclosures: Dr Chertkow sits on an adjudication board for clinical trials for Bristol-Myers Squibb and has been a speaker and advisory board member for Pfizer Canada.
Funding/Support: Dr Chertkow is supported by operating grants from the Canadian Institutes for Health Research and the Fonds de la recherche en santé du Québec.