1. Department of Radiology, Thomas Jefferson University Hospital, 132 S 10th St, Philadelphia, PA 19107
2. Mallinckrodt Institute of Radiology, Washington University in St. Louis School of Medicine, St. Louis, MO
3. Department of Radiology, Henry Ford Health System, Detroit, MI
4. Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN
5. Department of Radiology, University of Alabama at Birmingham, Birmingham, AL