Accepted for Publication: June 13, 2013.
Published Online: September 2, 2013. doi:10.1001/jamainternmed.2013.9763.
Study concept and design: Zimlichman, Song, Yamin, Keohane, Denham, Bates.
Acquisition of data: Zimlichman, Henderson, Tamir, Song, Yamin, Bates.
Analysis and interpretation of data: Zimlichman, Henderson, Franz, Song, Yamin, Keohane, Bates.
Drafting of the manuscript: Zimlichman, Henderson, Song, Yamin.
Critical revision of the manuscript for important intellectual content: Zimlichman, Henderson, Tamir, Franz, Keohane, Denham, Bates.
Statistical analysis: Zimlichman, Henderson, Franz, Song, Yamin.
Obtained funding: Zimlichman, Keohane, Denham, Bates.
Administrative, technical, or material support: Zimlichman, Tamir, Yamin, Keohane, Bates.
Study supervision: Zimlichman, Keohane, Denham, Bates.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was sponsored by the Texas Medical Institute of Technology, Austin, as part of a donation promoting research on patient safety.
Role of the Sponsor: The supporting institute had no involvement in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Additional Contributions: The authors would like to thank Ashish K. Jha, MD, MPH, Harvard School of Public Health (Boston, Massachusetts), for his contribution to the design of the study, and Nyssa A. Ackerley, MS, Eastern Research Group (Lexington, Massachusetts), for her assistance in data analysis.