1. Department of Radiology, University of Washington School of Medicine, Seattle, WA
2. Present address: Department of Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905
3. Department of Radiology, UT Southwestern Medical Center, Dallas, TX
4. Department of Radiology, University of Alabama at Birmingham, Birmingham, AL
5. Department of Radiology and Biomedical Imaging, University of California San Francisco Medical Center, San Francisco, CA
6. Department of Radiology, Duke University, Durham, NC
7. Department of Radiology, Division of Abdominal Imaging, Massachusetts General Hospital, Boston, MA