1 Department of Radiology, The Permanente Medical Group, Kaiser Permanente Medical Center, Santa Clara, 700 Lawrence Expy, Santa Clara, CA 95051, United States; Department of Radiology and Biomedical Imaging, University of California, San Francisco, 505 Parnassus Ave, L371, San Francisco, CA 94143, United States. Electronic address: mark.d.mamlouk@kp.org.
2 Division of Neurointerventional Radiology, Department of Radiology and Biomedical Imaging, University of California, San Francisco, 505 Parnassus Ave, L351, San Francisco, CA 94143, United States.
3 Department of Radiology and Biomedical Imaging, University of California, San Francisco, 505 Parnassus Ave, L371, San Francisco, CA 94143, United States; Department of Neurology, University of California, San Francisco, 505 Parnassus Ave, L371, San Francisco, CA 94143, United States.