Study concept and design: Matlock, Groeneveld, Goodrich, Gunter, Magid.
Acquisition of data: Matlock, Groeneveld, Sidney, Goodrich, Glenn, Reynolds, Cassidy-Bushrow, Lieu, Boudreau, Greenlee, Tom, Vupputuri, Adams, Smith, Gunter, Go, Magid.
Analysis and interpretation of data: Matlock, Shetterly, Goodrich, Xu, Yang, Farmer, Reynolds, Lieu, Go, Magid.
Drafting of the manuscript: Matlock, Groeneveld, Yang, Farmer, Lieu.
Critical revision of the manuscript for important intellectual content: Matlock, Groeneveld, Sidney, Shetterly, Goodrich, Glenn, Xu, Reynolds, Cassidy-Bushrow, Boudreau, Greenlee, Tom, Vupputuri, Adams, Smith, Gunter, Go, Magid.
Statistical analysis: Matlock, Groeneveld, Shetterly, Goodrich, Yang.
Obtained funding: Matlock, Groeneveld, Sidney, Xu, Greenlee, Go.
Administrative, technical, or material support: Matlock, Sidney, Glenn, Reynolds, Cassidy-Bushrow, Boudreau, Tom, Vupputuri, Go.
Study supervision: Matlock, Xu, Lieu, Gunter.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Cassidy-Bushrow reported that her institution has a contract with EpiSource to examine health outcomes of patients with type 2 diabetes treated with insulin. No other disclosures were reported.
Funding/Support: Dr Matlock was supported by a career development award from the National Institute on Aging (1K23AG040696). The study was supported by the National Heart, Lung, and Blood Institute and the Cardiovascular Research Network (U19 HL91179-01, 1RC2HL101666-01, and 1R01HL086919). Medicare data for the project were obtained under Agency for Healthcare Research and Quality grant 1R01HS018403.
Role of the Sponsors: The funders had no role in the design and conduct of the study; the collection, management, analysis, and interpretation of the data; the preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication.
Correction: This article was corrected online February 26, 2014, for incorrect degree information in the byline.