Department of Neurology, Toho University Faculty of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan. Department of Rehabilitation Medicine, Toho University Faculty of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan. Nutrition Therapy Center, Toho University Faculty of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan. Niigata National Hospital, National Hospital Organization, 3-52 Akasaka Kashiwazaki City, Niigata 945-8585, Japan. Department of Neurology, Toho University Faculty of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo 143-8541, Japan. Electronic address: osamu.kano@med.toho-u.ac.jp.