1 Department of Radiology, Keck School of Medicine, University of Southern California (USC), Los Angeles, California.
2 Department of Radiology, Keck School of Medicine, University of Southern California (USC), Los Angeles, California. Electronic address: ah_620@usc.edu.
3 Department of Radiology, Mayo Clinic, Rochester, Minnesota; Director of Clinical Research, Department of Radiology, Keck School of Medicine, University of Southern California (USC), Los Angeles, California.