1. Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
2. Department of Emergency Medicine, Brigham and Women's Hospital, Boston, MA, USA
3. Centaur Labs, Boston, MA, USA
4. Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada
5. Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
6. Departments of Neurosurgery and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA