1 From the Departments of Neurology and Medicine (D.B.C.), Washington University in St. Louis, MO; and Clinical Department of Neurology (T.B.), Medical University of Innsbruck, Austria. clifforddb@wustl.edu.
2 From the Departments of Neurology and Medicine (D.B.C.), Washington University in St. Louis, MO; and Clinical Department of Neurology (T.B.), Medical University of Innsbruck, Austria.