Author Contributions: Drs Burke and Chung 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: Burke, Shea, and Tracy. Acquisition of data: Burke, Shea, Tracy, andWatson. Analysis and interpretation of data: Burke, Bertoni, Watson, Blumenthal, Chung, and Carnethon. Drafting of the manuscript: Burke, Watson, and Chung. Critical revision of the manuscript for important intellectual content: Burke,Bertoni, Shea, Tracy, Watson, Blumenthal, Chung, andCarnethon. Statistical analysis: Chung. Obtained funding: Burke, Shea, and Tracy. Administrative, technical, and material support: Burke, Shea, Tracy, and Watson. Study supervision: Shea and Watson.