Kosuke Matsuzono1, Masayuki Suzuki2, Shigeru Fujimoto2. 1. Division of Neurology, Department of Medicine, Jichi Medical University School of Medicine, Yakushiji 3311-1, Shimotsuke, Tochigi, 329-0498, Japan. kmatsuzono51@jichi.ac.jp. 2. Division of Neurology, Department of Medicine, Jichi Medical University School of Medicine, Yakushiji 3311-1, Shimotsuke, Tochigi, 329-0498, Japan.