1. Department of Human Pathology Gunma University Graduate School of Medicine Maebashi Japan
2. Department of Neurosurgery Gunma University Graduate School of Medicine Maebashi Japan
3. Department of Neurosurgery Kanazawa University Graduate School of Medical Sciences Kanazawa Japan
4. Department of Human Pathology Kanazawa University Graduate School of Medical Sciences Kanazawa Japan
5. Department of Neurosurgery Dokkyo Medical University Mibu Japan
6. Department of Pathology Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
7. Department of Neurosurgery Faculty of Medicine University of Toyama Toyama Japan
8. Department of Neurosurgery Kumamoto University Graduate School of Medical Sciences Kumamoto Japan
9. Department of Pathology Saitama Medical University Moroyama Japan
10. Department of Neurosurgery Tokyo Medical University Tokyo Japan
11. Department of Pathology Gunma University Hospital Maebashi Japan