1. Department of Neurology, National Hospital Organization Hokkaido Medical Center, Japan
2. Miyoka Clinic, Japan
3. Department of Cancer Pathology, Faculty of Medicine, Hokkaido University, Japan
4. Department of Neurosurgery, Sapporo Azabu Neurosurgical Hospital, Japan
5. Department of Diagnostic Radiology, Sapporo City General Hospital, Japan
6. Department of Clinical Research, National Hospital Organization Hokkaido Medical Center, Japan