Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Kanzaria.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: All authors.
Administrative, technical, or material support: All authors.
Study supervision: Mattke, Brook.
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: This work was supported by the Robert Wood Johnson Clinical Scholars program, the US Department of Veterans Affairs, grant T32-HP-19001 (UCLA Institutional National Research Service Award) from the Health Resources and Services Administration, and funding from the RAND Corporation.
Role of the Funder/Sponsor: The funders/sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: We are grateful to Mary Vaiana, PhD (RAND Corporation), for her careful review of an earlier draft of this manuscript, for which she received compensation.