1. Departments of Radiology, Boston Medical Center, Boston University School of Medicine, Boston, MA
2. Neurology, Boston Medical Center, Boston University School of Medicine, Boston, MA
3. Department of Neurology, SUNY Upstate Medical University Hospital, USA
4. Department of Radiology, University of California San Diego School of Medicine, UC San Diego Health, San Diego, CA
5. Neurosurgery, Boston Medical Center, Boston University School of Medicine, Boston, MA