Accepted for Publication: April 21, 2014.
Published Online: August 25, 2014. doi:10.1001/jamaneurol.2014.1272.
Study concept and design: DeLong, Huang, Gallis, Turner, Lad.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: DeLong, Huang, Turner, Lad.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Huang, Gallis, Lokhnygina, Lad.
Obtained funding: Lad.
Administrative, technical, or material support: Huang, Parente, Lad.
Study supervision: Turner, Lad.
Conflict of Interest Disclosures: Dr Lad has consulted for and received grant support from Medtronic and St Jude Medical. He serves as director of the Duke Neuro-Outcomes Center, which has received research funding from National Institutes of Health grant KM1 CA 156687, Medtronic, and St Jude Medical. Dr Hickey has consulted for Medtronic. He serves as Fellowship director of the Duke Movement Disorders Center, which has received funding from Medtronic. No other disclosures are reported.
Funding/Support: Grant KM1 CA 156687 from the National Institutes of Health.
Role of the Funder/Sponsor: The National Institutes of Health supplied funding for the collection, management, analysis, and interpretation of the data but had no role in the design and conduct of the study; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.