Author Contributions: Dr Liu 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: Liu, Zingmond, Ettner, Brook, Ko.
Acquisition of data: Zingmond, Ko.
Analysis and interpretation of data: Liu, Zingmond, McGory, SooHoo, Ettner, Ko.
Drafting of the manuscript: Liu, Zingmond.
Critical revision of the manuscript for important intellectual content: Liu, Zingmond, McGory, SooHoo, Ettner, Brook, Ko.
Statistical analysis: Liu, Zingmond, McGory, SooHoo, Ettner.
Obtained funding: Zingmond.
Study supervision: Zingmond, Brook, Ko.
Financial Disclosures: None reported.
Funding/Support: This study was supported by a Veterans Administration/UCLA Multicampus Ambulatory Healthcare Fellowship (Dr Liu), by Career Development Award NIA 1K08AG023024 (Dr Zingmond), and by the UCLA Robert Wood Johnson Clinical Scholars Program (Dr McGory).
Role of the Sponsors: The funding organizations had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.