Author Contributions: Drs Mann and Muntner and Ms Ye 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: Mann, Woodward, and Muntner. Acquisition of data: Mann and Muntner. Analysis and interpretation of data: Mann, Woodward, Ye, Krousel-Wood, and Muntner. Drafting of the manuscript: Mann, Woodward, Ye, and Muntner. Critical revision of the manuscript for important intellectual content: Mann and Krousel-Wood. Statistical analysis: Mann, Woodward, Ye, and Muntner. Administrative, technical, and material support: Mann and Muntner. Study supervision: Woodward.