Accepted for Publication: September 3, 2014.
Published Online: December 22, 2014. doi:10.1001/jamainternmed.2014.6781.
Study concept and design: Jena, Prasad, Romley.
Acquisition, analysis, or interpretation of data: Jena, Goldman, Romley.
Drafting of the manuscript: Jena, Prasad.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Jena, Romley.
Obtained funding: Jena, Goldman.
Study supervision: Jena, Goldman.
Conflict of Interest Disclosures: Dr Goldman is a partner at Precision Health Economics, a health care consultancy conducting research in the life sciences. No other disclosures are reported.
Funding/Support: Dr Jena has received funding from the Office of the Director, National Institutes of Health (NIH Early Independence Award, grant 1DP5OD017897-01). Drs Goldman and Romley have received funding from the National Institute of Aging (grant 5P01AG033559).
Role of the Funder/Sponsor: The funding sources 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.