From the Departments of Neurology and Center for Molecular Medicine and Genetics (Dr. Shy), Wayne State University School of Medicine, Detroit, MI; Department of Neurology (Dr. Frohman), UT Southwestern Medical Center, Dallas, TX; Department of Neurology and Neurosciences (Dr. So), Stanford University Medical Center, CA; Department of Neuroscience (Dr. Arezzo), Albert Einstein College of Medicine, New York, NY; Department of Neurology (Dr. Cornblath), Johns Hopkins University School of Medicine, Baltimore, MD; Clinical Research and Development (Dr. Giuliani), Wyeth-Ayerst, Collegeville, PA; Department of Neurology (J.C. Kincaid), University of Indiana School of Medicine, Indianapolis; Department of Neurology (Dr. Ochoa), University of Oregon, Portland; Department of Neurology (Dr. Parry), University of Minnesota, Minneapolis; and Department of Neurology (Dr. Weimer), Columbia Presbyterian Medical Center, New York, NY.