1 Department of Radiology, Division of Interventional Radiology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA 94305. Electronic address: alexvez@stanford.edu.
2 Department of Radiology, Division of Interventional Radiology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA 94305.
3 Albert Einstein College of Medicine, Bronx, NY.
4 Department of Radiology & Biomedical Imaging, Division of Interventional Radiology, UCSF, San Francisco, CA 94143.