Author Contributions: Drs Mayr and Yende had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Mayr, Yende, Linde-Zwirble, Barnato, Angus
Acquisition of data: Linde-Zwirble
Analysis and interpretation of data: Mayr, Yende, Linde-Zwirble, Peck-Palmer, Barnato, Weissfeld, Angus
Drafting of the manuscript: Mayr, Yende
Critical revision of the manuscript for important intellectual content: Linde-Zwirble, Peck-Palmer, Barnato, Weissfeld, Angus
Statistical analysis: Mayr, Yende, Weissfeld
Obtained funding: Yende, Angus.
Study supervision: Linde-Zwirble, Barnato, Angus.
Financial Disclosures: None reported.
Funding/Support: Dr Mayr was supported by grant T32 HL007820-10, and Dr Yende was supported by grant K23GM083215 both from the National Institutes of Health.
Role of the Sponsor: The funding agencies had no role in the design and conduct of the study, collection, management, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: Dr Angus, contributing editor to JAMA, had no role in the evaluation of or decision to publish this article.