1 Department of Diagnostic Medicine, University of Texas at Austin Dell Medical School, 1601 Trinity St., Bldg. B, Stop Z0300, Austin, TX 78712. Electronic address: Nick.Bryan@austin.utexas.edu.
2 Center for Biomedical Image Computing and Analytics, University of Pennsylvania, Philadelphia, Pennsylvania.
3 Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland, Maryland.
4 Department of Radiology, Division of Neuroradiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
5 Department of Radiology and Biomedical Imaging, University of California, San Francisco, California.