1. Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco2now with Department of Radiology, NYU Langone Medical Center, Garden City, New York
2. Department of Quality and Safety, American College of Radiology, Reston, Virginia
3. Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco
4. Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison
5. Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania