From the Department of Neurology, College of Physicians and Surgeons (Drs. Kaufmann, Gordon, Rowland, and Mitsumoto, and M.L. DelBene and V. Battista), and the Department of Biostatistics, Mailman School of Public Health (Drs. Levy, Thompson, and Levin), Columbia University, New York, NY.(2005-01-11時点)