Accepted for Publication: December 19, 2013.
Published Online: April 21, 2014. doi:10.1001/jamainternmed.2014.1073.
Study concept and design: McWilliams, Chernew, Landon.
Acquisition of data: McWilliams, Dalton.
Analysis and interpretation of data: McWilliams, Landon.
Drafting of the manuscript: McWilliams.
Critical revision of the manuscript for important intellectual content: McWilliams, Chernew, Dalton, Landon.
Statistical analysis: McWilliams, Chernew, Dalton.
Obtained funding: McWilliams.
Administrative, technical, or material support: McWilliams, Dalton.
Study supervision: McWilliams.
Conflict of Interest Disclosures: None reported.
Funding/Support: This research was supported by grants from the Beeson Career Development Award Program (the American Federation for Aging Research and National Institute on Aging grant K08 AG038354), the Doris Duke Charitable Foundation (Clinical Scientist Development Award 2010053), and National Institute on Aging grant P01 AG032952.
Role of the Sponsors: The funding sources did not play a role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, and approval of the manuscript.
Additional Contributions: We are grateful to Pasha Hamed, MA, Department of Health Care Policy, Harvard Medical School, for statistical programming support. Mr Hamed’s contributions were supported by the same funding sources as the authors’ contributions.