Author Contributions: Drs Korley and Pham 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: Korley, Pham, Kirsch.
Acquisition of data: Pham.
Analysis and interpretation of data: Korley, Pham.
Drafting of the manuscript: Korley, Pham, Kirsch.
Critical revision of the manuscript for important intellectual content: Korley, Pham, Kirsch.
Statistical analysis: Pham.
Administrative, technical, or material support: Korley.
Study supervision: Kirsch.
Financial Disclosures: None reported.
Funding/Support: Dr Korley is supported by the Robert E. Meyerhoff Professorship at the Johns Hopkins University School of Medicine, and by grant 5KL2RR025006 from the National Center Research Resources, a component of the National Institutes of Health (NIH), and the NIH Roadmap for Medical Research.
Role of the Sponsor: No funding organizations played a role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Disclaimer: The contents of this publication are solely the responsibility of the authors and do not necessarily represent the official view of the National Center Research Resources or the National Institutes of Health.