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