1. Department of Neurosurgery, Osaka Medical and Pharmaceutical University
2. Department of Neurosurgery, Juntendo University
3. Department of Neurosurgery, Aichi Medical University
4. Department of Neurosurgery, Tominaga Hospital
5. Department of Neurosurgery, Shinshu University School of Medicine
6. Department of Neurosurgery, Hokkaido Neurosurgical Memorial Hospital
7. Department of Minimally Invasive Spine Surgery Center, Shin-yurigaoka General Hospital
8. Department of Neurosurgery, Mie University
9. Department of Neurosurgery, Nara Medical University
10. Department of Neurosurgery, Tsukazaki Hospital
11. Department of Spinal Surgery, Akita Cerebrospinal and Cardiovascular Center
12. Department of Spinal Surgery, Sendai East Neurosurgical Hospital
13. Spinal Disorders Center, Fujieda Heisei Memorial Hospital
14. Department of Neurosurgery, Inazawa Municipal Hospital
15. Department of Neurosurgery, Sapporo Azabu Neurosurgical Hospital
16. Neurologic Surgery, Symphony Clinic