1. Faculty of Cancer PathologyHokkaido University Graduate School of Medicine Sapporo Japan
2. Faculty of NeurosurgeryHokkaido University Graduate School of Medicine Sapporo Japan
3. Department of PsychiatryIwamizawa Municipal General Hospital Iwamizawa Japan
4. Laboratory of NeuropathologyTokyo Metropolitan Institute of Medical Science Setagaya Japan
5. Department of PathologySapporo Higashi‐Tokushukai Hospital Sapporo Japan