1. Mallinckrodt Institute of Radiology, Washington University in St. Louis, 510 S Kingshighway Blvd, St. Louis, MO 63110
2. Department of Radiology, University of Alabama at Birmingham, Birmingham, AL
3. Department of Radiology, Johns Hopkins Outpatient Center, Johns Hopkins University, Baltimore, MD
4. Department of Diagnostic Radiology, Mayo Clinic, Rochester, MN
5. Department of Radiology, The Perelman School of Medicine at the University of Pennsylvania Hospital, Philadelphia, PA
6. Department of Diagnostic Imaging, Rhode Island Hospital, Brown University, Providence, RI
7. Department of Radiology, University of Kentucky, Lexington, KY
8. Department of Radiology, Stanford University Medical Center, Stanford, CA