1 Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan. yshimoji@shinshu-u.ac.jp.
2 Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan.