Author Contributions: Dr Smith 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: Yourman, Lee, Schonberg, Widera, Smith.
Acquisition of data: Yourman, Smith.
Analysis and interpretation of data: Yourman, Lee, Schonberg, Smith.
Drafting of the manuscript: Yourman, Lee, Smith.
Critical revision of the manuscript for important intellectual content: Yourman, Lee, Schonberg, Widera, Smith.
Obtained funding: Smith.
Administrative, technical, or material support: Yourman, Schonberg, Widera, Smith.
Study supervision: Widera, Smith.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: Dr Yourman was supported by a National Institute on Aging T32 predoctoral fellowship position (5T32AG000212). Dr Smith was supported by career development grants from the Greenwall Foundation and the National Center for Research Resources to the Clinical and Translational Science Institute–University of California, San Francisco (UL1 RR024131).
Role of the Sponsor: 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.
Additional Contributions: We gratefully acknowledge Gloria Won, MLIS, H. M. Fishbon Memorial Library, University of California, San Francisco, for her help with searching EMBASE. She did not receive compensation for her contribution.