Author Contributions: Dr Lin had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Lin, Suarez-Cuervo, Ward, Segal.
Acquisition of data: Lin, Erekosima, Kim, Ramanathan, Suarez-Cuervo, Chelladurai, Ward.
Analysis and interpretation of data: Lin, Erekosima, Kim, Ramanathan, Suarez-Cuervo, Chelladurai, Segal.
Drafting of the manuscript: Lin, Erekosima, Chelladurai, Ward.
Critical revision of the manuscript for important intellectual content: Lin, Erekosima, Kim, Ramanathan, Suarez-Cuervo, Chelladurai, Segal.
Statistical analysis: Lin, Erekosima, Ramanathan, Chelladurai.
Obtained funding: Lin, Segal.
Administrative, technical, or material support: Ramanathan, Suarez-Cuervo, Chelladurai, Ward.
Study supervision: Lin, Erekosima, Segal.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Lin reported serving as a consultant to Wellpoint. No other author reported disclosures.
Funding/Support: This study was funded by grant HHSA 290 2007 10061 I from the Agency for Healthcare Research and Quality (AHRQ) and is based on research conducted at the Johns Hopkins University Evidence-based Practice Center under contract HHSA 290 2007 10061 I.
Role of the Sponsor: The AHRQ participated in formulating the key questions and reviewed planned methods and data analyses, as well as interim and final evidence reports but had no role in the study selection; quality ratings; interpretation or synthesis of the evidence; or preparation, review, or approval of the manuscript.
Disclaimer: The authors of this article are responsible for its contents, including any clinical or treatment recommendations. No statement in this article should be construed as an official position of AHRQ or of the US Department of Health and Human Services.
Additional Contributions: We acknowledge Peter S. Creticos, MD, N. Franklin Adkinson, MD, and Daniela Vollenweider, MD (Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland), who assisted in the initial review of the abstracts and publications that were screened and subsequently selected for inclusion. Drs Creticos and Adkinson also helped develop the initial protocol for application of the Evidence-based Practice Center's methods guide on grading of the included studies, which constituted the work product for this evidence-based review. Dr Creticos was the initial principal investigator. Per the funder's (AHRQ) request, to ensure the compliance with established AHRQ conflict of interest policy including perceived conflicts of interest, Drs Creticos and Adkinson were recused from the following review activities including data extraction, assessment of study quality, and report writing due to their prior consulting arrangements. These individuals received support through grant funding from the AHRQ during the time of their contributions.
This article was corrected for errors on July 29, 2013.