1. Department of Neurology, Harvard Medical School and BIDMC, Boston, Massachusetts.
2. Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois.
3. Department of Neurology and Neuroscience, Weill Medical College of Cornell University, Ithaca, New York.
4. Burke/Cornell Medical Research Institute and The Burke Rehabilitation Hospital, White Plains, New York.