Published Online: March 17, 2014. doi:10.1001/jamainternmed.2014.173.
Study concept and design: Callaghan, Kerber, Pace, Burke.
Acquisition of data: Pace, Burke.
Analysis and interpretation of data: Callaghan, Kerber, Pace, Skolarus, Burke.
Drafting of the manuscript: Callaghan, Pace, Burke.
Critical revision of the manuscript for important intellectual content: Callaghan, Kerber, Pace, Skolarus.
Statistical analysis: Callaghan, Burke.
Administrative, technical, and material support: Burke.
Study supervision: Pace.
Conflict of Interest Disclosures: None reported.
Funding/Support: Dr Callaghan is supported by the Katherine Rayner Program, the Taubman Medical Institute, and grant K23NS079417 from the National Institutes of Health, National Institute of Neurological Disorders and Strokes. Dr Kerber is supported by grant R18 HS017690 from the Agency for Healthcare Research and Quality. Dr Skolarus is supported by grant K23NS073685 from the National Institutes of Health, National Institute of Neurological Disorders and Stroke. Dr Burke is supported by grant K08NS082597 from the National Institutes of Health, National Institute of Neurological Disorders and Strokes.
Role of the Sponsor: The sponsors had no role in the design and conduct of the study; collection, management, analysis, or interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: Wade Cooper, MD, University of Michigan, contributed in critical reviewing the manuscript. He received no compensation for his contribution.