1. Department of Neurosurgery, Tokyo Medical Dental University
2. Department of Neurosurgery, JA Toride Medical Center
3. Department of Neurosurgery, Tsuchiura Kyodo General Hospital
4. Department of Neurosurgery, Kanto Rosai Hospital
5. Department of Neurosurgery, National Hospital Organization Disaster Medical Center
6. Department of Neurosurgery, Ome Municipal General Hospital
7. Department of Endovascular surgery, Tokyo Medical Dental University