Author Contributions: Dr Dahabreh had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Studyconcept and design: Dahabreh, Paulus.
Acquisition of data: Dahabreh.
Analysis and interpretation of data: Dahabreh, Paulus.
Drafting of the manuscript: Dahabreh.
Critical revision of the manuscript for important intellectual content: Dahabreh, Paulus.
Statistical analysis: Dahabreh.
Obtained funding: Paulus.
Administrative, technical, or material support: Dahabreh.
Study supervision: Paulus.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was supported in part by award UL1RR025752 from the National Center for Research Resources.
Role of the Sponsor: The sponsor had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Center for Research Resources or the National Institutes of Health.
Additional Contributions: We thank Thomas Trikalinos, MD, PhD, and George Kitsios, MD, PhD, both at Tufts Medical Center, Boston, Massachusetts, for their comments on a previous version of the manuscript. We also thank Dr Trikalinos for helpful discussions on the statistical methods and Teruhiko Terasawa, MD, PhD (Fujita Health University Nanakuri Sanatorium, Tsu, Mie, Japan), and Monika Schoels, MD (Hietzing Hospital, Vienna, Austria), for help in translating non–English language articles (Japanese and German, respectively). Drs Trikalinos, Kitsios, Terasawa, and Schoels did not receive any compensation for their contributions.