1. Departments of Neurology and Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY (F.M.E.).
2. Neurology Service, VA Bronx Healthcare System, NY (F.M.E.).
3. Departments of Neurology and Molecular and Integrative Physiology, University of Michigan, Ann Arbor (M.M.W.).
4. Neurology Service, VA Ann Arbor Healthcare System, MI (M.M.W.).
5. Department of Neurology, Mayo Clinic, Jacksonville, FL (J.F.M.).