Accepted for Publication: November 6, 2013.
Published Online: April 14, 2014. doi:10.1001/jamaneurol.2013.5762.
Study concept and design: Kuo.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Kuo.
Critical revision of the manuscript for important intellectual content: Goldman, Quinzii, Dunning-Broadbent, Waters, Mitsumoto, Brannagan, Cosentino, Huey, Nagy.
Administrative, technical, or material support: Goldman, Quinzii, Dunning-Broadbent, Waters.
Study supervision: Cosentino, Huey, Kuo.
Conflict of Interest Disclosures: None reported.
Funding/Support: Ms Goldman received funding from the National Institute on Aging [NIA]/National Institutes of Health [NIH] (grant P50 AG08702; principal investigator: Michael Shelanski, MD, PhD), the National Institute of Neurological Disorders and Stroke (NINDS)/NIH (grant R01NS076837-01A1; principal investigator: Edward D. Huey, MD), and the Parkinson’s Disease Foundation. Dr Mitsumoto received funding from the NIH (grant R01-ES016348), the Spastic Paraplesia Foundation, and the Muscular Dystrophy Association. Dr Cosentino is funded by the NINDS/NIH (grant R01NS076837) and NIA/NIH (grant P50AG008702). Dr Huey is funded by the NINDS/NIH (grants R01NS076837 and R00NS060766), the Florence and Herbert Irving Clinical Research Career Award, and the NIA/NIH (grants P50AG008702, R01AG041795, and R0103873402). Drs Dunning-Broadbent and Nagy are funded by the NINDS/NIH (grant 5R01NS64253-5). Dr Kuo received funding from the NIH (grant K08 NS083738), the Louis V. Gerstner Jr Scholar Award, the Parkinson’s Disease Foundation, the American Academy of Neurology Research Fellowship, and the American Parkinson’s Disease Association.
Role of the Sponsor: The funders 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.