1. Department of Radiology, New York University Langone Medical Center, New York, New York
2. Harvey L. Neiman Health Policy Institute, Reston, Virginia
3. School of Economics, Georgia Institute of Technology, Atlanta, Georgia
4. Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, Georgia
5. Department of Radiology, Grandview Medical Center, Birmingham, Alabama
6. Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut