1 Department of Neurology, Brigham and Women's Hospital, Boston, MA, United States; Harvard Medical School, Boston, MA, United States. Electronic address: tbkaplan@bwh.harvard.edu.
2 Department of Neurology, Brigham and Women's Hospital, Boston, MA, United States; Harvard Medical School, Boston, MA, United States.
3 Harvard Medical School, Boston, MA, United States.
4 Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, NY, United States.