Author Contributions: Dr Smith-Bindman 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: Smith-Bindman and Lipson. Acquisition of data: Smith-Bindman, Lipson, and Marcus. Analysis and interpretation of data: Smith-Bindman, Kim, Mahesh, Gould, Berrington de González, and Miglioretti. Drafting of the manuscript: Smith- Bindman, Lipson, Gould, and Miglioretti. Critical revision of the manuscript for important intellectual content: Smith-Bindman, Marcus, Kim, Mahesh, Berrington de González, and Miglioretti. Statistical analysis: Smith-Bindman, Marcus, Gould, Berrington de González, and Miglioretti. Obtained funding: Smith-Bindman. Administrative, technical, and material support: Smith-Bindman, Lipson, Kim, and Mahesh. Study supervision: Smith-Bindman.