1. Department of Radiology, Division of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital, Harvard Medical School, 55 Fruit St, Yawkey 6E, Boston, MA 02114.
2. Harvey L. Neiman Health Policy Institute, Reston, VA.
3. Department of Radiology, University of Colorado, Aurora, CO.
4. Department of Radiology, NYU Langone Health, New York, NY.