1. Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1364 Clifton Road NE, Ste D112, Atlanta, GA 30322.
2. Department of Health Policy and Management, Rollins School of Public Health, Emory University, Atlanta, GA.
3. NYU Langone Medical Center, New York, NY.
4. Harvey L. Neiman Health Policy Institute, Reston, VA.
5. School of Economics, Georgia Institute of Technology, Atlanta, GA.