1. Department of Neurovascular Research, Kobe City Medical Center General Hospital
2. Department of Neurosurgery, Hyogo Medical University
3. Department of Neurosurgery, National Cerebral and Cardiovascular Center
4. Department of Neurosurgery, Kyoto University
5. Department of Neurosurgery, University of Tsukuba
6. Department of Neurosurgery, Kindai University
7. Department of Neurosurgery, Konan Hospital
8. Department of Neurosurgery, Juntendo University
9. Department of Neurosurgery, Iwate Prefectural Central Hospital
10. Department of Neurosurgery, National Hospital Organization Sendai Medical Center
11. Department of Neurosurgery, Sapporo Shiroishi Memorial Hospital
12. Department of Neurosurgery, Ota Memorial Hospital
13. Department of Neurosurgery, Dokkyo University Saitama Medical Center
14. Department of Neurosurgery, Seijinkai Shimizu Hospital