1. Department of Neuropathology Research Institute for Brain and Blood Vessels, Akita Cerebrospinal and Cardiovascular Center Akita Japan
2. Akita University School of Medicine Akita Japan
3. Department of Pathology Kurume University School of Medicine Kurume Japan
4. Department of Neuropathology St. Mary's Hospital Kurume Japan
5. Department of Neurology San‐in Rosai Hospital Yonago Japan
6. Department of Neurosurgery San‐in Rosai Hospital Yonago Japan
7. Department of Pathology San‐in Rosai Hospital Yonago Japan