1. Department of Neurology, University of Utah, Salt Lake City (A.d.H.).
2. Department of Neurology, Yale University, New Haven, CT (K.S.).
3. Department of Neurology, University of Virginia, Charlottesville (K.C.J.).
4. Department of Neurology, Washington University (M.A.).
5. Department of Neurology, Brown University, Providence, RI (S.Y.).
6. Department of Neurology, University of Washington (D.T.).
7. Department of Neurology, Boston University, MA (J.N.).