Author Contributions: Dr Harris 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: Harris, Maron.
Acquisition of data: Harris, Henry, Rohman, Haas, Maron.
Analysis and interpretation of data: Harris, Maron.
Drafting of the manuscript: Harris, Henry, Rohman, Haas, Maron.
Critical revision of the manuscript for important intellectual content: Harris, Maron.
Statistical analysis: Henry.
Obtained funding: Harris, Maron.
Administrative, technical, or material support: Harris, Henry, Rohman, Haas, Maron.
Financial Disclosures: None reported.
Funding/Support: This study was supported by the Hearst Foundations, San Francisco, California.
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.
Additional Contributions: James S. Hodges, PhD, Division of Biostatistics, University of Minnesota, provided statistical advice and analysis as a contract employee of the Minneapolis Heart Institute Foundation.