1 Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts and Harvard Medical School, Boston, Massachusetts. Electronic address: pslanetz@bidmc.harvard.edu.
2 Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California.
3 Department of Radiology, University of Southern California, Los Angeles, California.
4 Department of Radiology, Duke University Medical Center, Durham, North Carolina.
5 Department of Radiology, University of Chicago, Chicago, Illinois.
6 Department of Radiology, Vanderbilt University Medical Center, Nashville, Tennessee.