1. Einstein Medical Center, Philadelphia, PA.
2. Medstar Georgetown University Hospital, Washington, DC.
3. UT Houston McGovern School of Medicine, Houston, TX.
4. University of Iowa Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA.
5. VA San Diego Healthcare System, San Diego, CA.
6. Medical University of South Carolina, Charleston, SC.
7. Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, GA.
8. Oregon Health and Sciences University, Portland, OR.
9. Mayo Clinic, Rochester, MN.
10. Wake Forest School of Medicine, Winston-Salem, NC.
11. Imaging Institute, Cleveland Clinic, Cleveland, OH.
12. Department of Radiology, Massachusetts General Hospital and Harvard Medical School, 55 Fruit St, Boston, MA 02114.