1. Department of Neurology, National Hospital Organization Hokkaido Medical Center, Japan
2. Department of Clinical Research, National Hospital Organization Hokkaido Medical Center, Japan
3. Department of Rheumatology, National Hospital Organization Hokkaido Medical Center, Japan
4. Department of Cancer Pathology, Faculty of Medicine, Hokkaido University, Japan
5. Department of Pathology, National Hospital Organization Hokkaido Medical Center, Japan