Accepted for Publication: July 3, 2014.
Published Online: September 29, 2014. doi:10.1001/jamainternmed.2014.4193.
Study concept and design: Zuckerman, Brown.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Zuckerman, Brown.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Zuckerman, Brown.
Obtained funding: Zuckerman, Brown.
Study supervision: Zuckerman, Brown.
Conflict of Interest Disclosures: Dr Zuckerman reports owning stock in Johnson & Johnson.
Funder/Sponsor: Support for this project was provided by The Pew Charitable Trusts (Dr Zuckerman) and by donations to the National Center for Health Research.
Role of the Sponsor: The funding sources 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 views expressed are those of the authors and do not necessarily reflect the views of The Pew Charitable Trusts.
Additional Contributions: Joshua Rising, MD, MPH, of Pew Charitable Trusts, provided feedback on study design. Maura Duffy, BA, of the National Center for Health Research, provided administrative and technical support. Neither received financial compensation.