1. Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1364 Clifton Rd, NE, Ste D112, Atlanta, GA 30322.
2. Harvey L. Neiman Health Policy Institute, Reston, VA.
3. School of Economics, Georgia Institute of Technology, Atlanta, GA.
4. Department of Radiology, Ochsner Health System, Jefferson, LA.