Author Contributions: Dr Pellikka 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: Grewal, McCully, Kane, Pellikka.
Acquisition of data: McCully, Pellikka.
Analysis and interpretation of data: Grewal, McCully, Kane, Lam, Pellikka.
Drafting of the manuscript: Grewal, Lam, Pellikka.
Critical revision of the manuscript for important intellectual content: Grewal, McCully, Kane, Lam, Pellikka.
Statistical analysis: Grewal, Lam.
Obtained funding: Pellikka.
Administrative, technical, or material support: McCully, Pellikka.
Study supervision: McCully, Pellikka.
Financial Disclosures: None reported.
Funding/Support: This study was supported in part by grant No. 1 UL1 RR024150 (for biostatistical analysis) from the National Center for Research Resources, a component of the National Institutes of Health (NIH); the NIH Roadmap for Medical Research; and the Mayo Foundation (data management).
Role of the Sponsor: The funding sources 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.