Author Contributions: Dr T. Henry 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: C. Henry, Satran, T. Henry.
Acquisition of data: C. Henry, Satran, Adkinson, Nicholson, T. Henry.
Analysis and interpretation of data: C. Henry, Satran, Lindgren, Adkinson, T. Henry.
Drafting of the manuscript: C. Henry, Satran, Lindgren, T. Henry.
Critical revision of the manuscript for important intellectual content: C. Henry, Satran, Lindgren, Adkinson, Nicholson, T. Henry.
Statistical analysis: Satran, Lindgren, T. Henry.
Obtained funding: T. Henry.
Administrative, technical, or material support: C. Henry, Adkinson, Nicholson, T. Henry.
Study supervision: Adkinson, T. Henry.
Financial Disclosures: None reported.
Funding/Support: This study was supported by an unrestricted educational grant from the Minneapolis Heart Institute Foundation.
Role of the Sponsor: The Minneapolis Heart Institute Foundation had no role in the design and conduct of the study; collection, management, analysis, or interpretation of the data; nor any role in preparation, review, or approval of the manuscript.
Acknowledgment: We thank Sue Duval, PhD, of the University of Minnesota Division of Epidemiology and Community Health, for assistance with statistical analysis.