1. Department of Neurosurgery, Akita University Graduate School of Medicine
2. Department of Neurosurgery, Brain Research Institute, Niigata University
3. Department of Neurosurgery, Tohoku University Graduate School of Medicine
4. Department of Neurosurgery, Hirosaki University Graduate School of Medicine
5. Department of Neurosurgery, Iwate Medical University
6. Department of Neurosurgery, Faculty of Medicine, Yamagata University
7. Department of Neurosurgery, Fukushima Medical University
8. Department of Human Pathology, Gunma University Graduate School of Medicine
9. Department of Pathology, Hidaka Hospital
10. Department of Molecular Cancer Science, Yamagata University School of Medicine
11. Department of Advanced Medicine, Faculty of Medicine, Yamagata University