1. Department of Radiology, Stanford University, Stanford, California, USA.
2. Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
3. Department of Electrical Engineering, Stanford University, Stanford, California, USA.
4. Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, USA.
5. Department of Radiology, Harvard Medical School, Boston, Massachusetts, USA.
6. Department of Neurosurgery, Stanford University, Stanford, California, USA.