○Kazuki Okamoto¹, Yasuhiro R. Tanaka², Shigeki Kato³, Kazuto Kobayashi³, Masato Koike¹, Hiroyuki Hioki¹ (1. Juntendo Univ Grad Sch Med, Tokyo, Japan, 2. Brain Sci Inst, Tamagawa Univ, Tokyo, Japan, 3. Fukushima Med Univ Sch Med, Fukushima, Japan)