Accepted for Publication: December 26, 2012.
Published Online: May 29, 2013. doi:10.1001/jamasurg.2013.72
Study concept and design: Brotman, Kebede, Haut, Sharma, Shermock, Chelladurai, Singh.
Acquisition of data: Brotman, Shihab, Prakasa, Kebede, Haut, Sharma, Chelladurai, Singh.
Analysis and interpretation of data: Brotman, Shihab, Prakasa, Haut, Shermock, Chelladurai, Singh, Segal.
Drafting of the manuscript: Brotman, Kebede, Sharma, Shermock, Segal.
Critical revision of the manuscript for important intellectual content: Brotman, Shihab, Prakasa, Haut, Shermock, Chelladurai, Singh, Segal.
Statistical analysis: Shihab, Prakasa, Shermock, Chelladurai, Singh.
Obtained funding: Segal. Administrative, technical, and material support: Kebede, Sharma, Shermock, Chelladurai.
Study supervision: Brotman, Sharma, and Segal.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded by the Agency for Healthcare Research and Quality (AHRQ) contract HHSA-290-2007-10061 I.
Role of the Sponsors: The AHRQ participated in formulating key question and reviewed planned methods and data analyses, as well as interim and final evidence reports. The AHRQ had no role in the study selection, quality ratings, interpretation, or synthesis of the evidence.
Disclaimer: No statement in this article should be construed as an official position of the AHRQ or of the US Department of Health and Human Services.