1. Department of Neurology, University of California–San Francisco4Center for Neuroimmunology, Service of Neurology, Hospital Clinic and Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
2. Department of Epidemiology and Biostatistics, University of California–San Francisco
3. Department of Neurology, University of California–San Francisco
4. Department of Radiology, University of California–San Francisco
5. Department of Neurology, University of California–San Francisco2Department of Radiology, University of California–San Francisco5Department of Neurology, Yale University, New Haven, Connecticut6Department of Diagnostic Radiology, Yale University, New Haven