1. David Geffen School of Medicine at University of California, Los Angeles, Department of Radiological Sciences, Santa Monica, CA, USA
2. Stanford University School of Medicine, Department of Radiology, Stanford, CA,USA
3. University of California, San Diego, Department of Radiology, La Jolla, CA,USA
4. Duke University Medical Center, Department of Radiology, Durham, NC,USA
5. Sutter Health, Palo Alto Medical Foundation, Department of Radiology, Palo Alto, CA,USA
6. The University of Texas MD Anderson Cancer Center, Department of Diagnostic Radiology, Houston, TX,USA
7. Kaiser Permanente, Department of Radiology, Walnut Creek, CA,USA
8. University of California, San Francisco, Department of Radiology and Biomedical Imaging, San Francisco, CA,USA
9. University of California, Irvine Medical Center, Department of Radiological Sciences, Orange, CA,USA
10. Santa Clara Valley Medical Center, Department of Radiology, San Jose, CA,USA
11. University of California, Davis, Department of Radiology, Sacramento, CA,USA