Accepted for Publication: February 10, 2014.
Published Online: May 5, 2014. doi:10.1001/jamainternmed.2014.1359.
Conflict of Interest Disclosures: None reported.
Funding/Support: From July 1, 2005, through June 30, 2013, HealthNewsReview.org received financial support from the Informed Medical Decisions Foundation, Boston, Massachusetts.
Role of the Sponsor: Informed Medical Decisions Foundation 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.