Author Contributions: Dr Hsu had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Hsu, Fung, Brand.
Acquisition of data: Hsu, Fung, Huang.
Analysis and interpretation of data: Hsu, Fung, Price, Huang, Brand, Hui, Fireman, Newhouse.
Drafting of the manuscript: Hsu, Fung, Price, Brand.
Critical revision of the manuscript for important intellectual content: Hsu, Huang, Brand, Hui, Fireman, Newhouse.
Statistical analysis: Hsu, Fung, Price, Huang, Brand, Fireman, Newhouse.
Obtained funding: Hsu, Fung.
Administrative, technical, or material support: Hsu, Fung.
Study supervision: Hsu, Newhouse, Fung.
Financial Disclosures: Dr Newhouse is a director of and holds equity in Aetna. None of the other authors reported any disclosures.
Funding/Support: The National Institute on Aging (grant R01 AG029316), the Agency for Healthcare Research and Quality, the National Institute on Aging (grant R01 HS013902), the Alfred P. Sloan Foundation, and the Kaiser Foundation Research Institute provided funding for this study.
Role of the Sponsor: The organizations funding this study had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.