1. From the Department of Radiology and Biomedical Imaging, University of California, San Francisco, Calif (L.M.S., H.H.C., D.J.S.); Department of Radiology, Zuckerberg San Francisco General Hospital, 1001 Potrero Ave, 1X57, San Francisco, CA 94110 (L.M.S.); and Department of Radiology, Einstein Healthcare Network, Philadelphia, Pa (M.M.H.).