Submitted for Publication: December 13, 2012; final revision received May 16, 2013; accepted May 19, 2013.
Published Online: October 14, 2013. doi:10.1001/jamainternmed.2013.10391.
Study concept and design: Meissner, Fässler, Kleijnen, Hróbjartsson, Antes, Linde.
Acquisition of data: Meissner, Fässler, Linde.
Analysis and interpretation of data: Meissner, Fässler, Rücker, Kleijnen, Hróbjartsson, Schneider, Linde.
Drafting of the manuscript: Meissner, Rücker.
Critical revision of the manuscript for important intellectual content: Fässler, Rücker, Kleijnen, Hróbjartsson, Schneider, Antes, Linde.
Statistical analysis: Meissner, Rücker, Kleijnen.
Obtaining funding: Meissner, Kleijnen, Linde.
Administrative, technical, or material support: Schneider, Fässler, Antes.
Study supervision: Kleijnen, Antes, Linde.
Conflicts of Interest Disclosures: None reported.
Funding/Support: This study was supported by grant 01KG0924 from the German Ministry of Education and Research.
Role of the Sponsor: The funding source 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.