Accepted for Publication: May 17, 2013.
Published Online: September 16, 2013. doi:10.1001/jamaneurol.2013.3579.
Study concept and design: Savica, Grossardt, Rocca.
Acquisition of data: Savica, Bower, Boeve, Ahlskog.
Analysis and interpretation of data: Savica, Grossardt, Rocca.
Drafting of the manuscript: Savica, Rocca.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Grossardt.
Obtained funding: Savica, Rocca.
Administrative, technical, or material support: Savica, Rocca.
Study supervision: Savica.
Conflict of Interest Disclosures: None reported.
Funding/Support: The study was supported by the National Institute on Aging of the National Institutes of Health under award R01AG034676 and by the Mayo Foundation for Medical Education and Research.
Role of the Sponsors: The funding organizations had no involvement in the design and conduct of the study, in the collection, management, analysis, and interpretation of the data, and in the preparation, review, and approval of the manuscript.
Disclaimer: The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Additional Contributions: We thank Lori Reinstrom, BA, and Carol Greenlee, BA, for assistance with typing and formatting the manuscript.