1. Department of Neurology, Comprehensive Neurology Division, Massachusetts General Hospital, Boston, MA, USA
2. Department of Radiology, Hospital of the University of Pennsylvania, Pennsylvania, PA, USA
3. Infectious Diseases Division, Yale New Haven Hospital, New Haven, CT, USA
4. Department of Neurology, Neuroimmunology and Neuro-Infectious Disease Division, Massachusetts General Hospital, Boston, MA, USA