1. Department of Neurology, Saiseikai Utsunomiya Hospital, Utsunomiya-city, Tochigi, Japan
2. Department of Neurosurgery, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
3. Department of Endocrinology and Nephrology, Saiseikai Utsunomiya Hospital, Utsunomiya-city, Tochigi, Japan