Published Online: April 22, 2014. doi:10.1001/jama.2014.4766.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Moniz, Chang.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Moniz, Davis.
Administrative, technical, or material support: Moniz, Davis.
Study supervision: Davis, Chang.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Davis reported that he serves as chief medical executive for the Michigan Department of Community Health. No other disclosures were reported.
Funding/Support: This study was funded by the Robert Wood Johnson Foundation Clinical Scholars program and the University of Michigan Health System.
Role of the Sponsor: The Robert Wood Johnson Foundation Clinical Scholars program and the University of Michigan Health System 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.
Disclaimer: The findings and statements included herein are those of the authors and do not necessarily represent the opinions of the Michigan Department of Community Health.