1. From the Department of Neurology, Beth Israel Deaconess Hospital and Harvard Medical School, Boston, Massachusetts, USA
2. Department of Neurology, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA
3. Department of Pathology, Beth Israel Deaconess Hospital and Harvard Medical School, Boston, Massachusetts, USA
4. Department of Neurosurgery, Beth Israel Deaconess Hospital and Harvard Medical School, Boston, Massachusetts, USA
5. Department of Surgery, Hamilton General Hospital, Hamilton, Ontario, Canada
6. Khoury College of Computer Sciences, Northeastern University, Boston, Massachusetts, USA