Accepted for Publication: January 11, 2013.
Published Online: May 20, 2013. doi: 10.1001/jamaneurol.2013.114
Study concept and design: Savica and Rocca.
Acquisition of data: Savica and Bower.
Analysis and interpretation of data: Grossardt, Bower, Ahlskog, and Rocca.
Drafting of the manuscript: Savica, Ahlskog, and Rocca.
Critical revision of the manuscript for important intellectual content: Grossardt, Bower, Ahlskog, and Rocca.
Statistical analysis: Grossardt.
Obtained funding: Rocca.
Administrative, technical, or material support: Savica and Rocca.
Study supervision: Bower and Rocca.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by award R01AG034676 from the National Institute on Aging of the National Institutes of Health and by the Mayo Foundation for Medical Education and Research.
Disclaimer: The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.