1. Department of Orthopedic Surgery, Akita University Graduate School of Medicine
2. The Project Committee of the Japanese Society for Spine Surgery and Related Research (JSSR)
3. Division of Orthopedic Surgery, Hamamatsu University School of Medicine
4. Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine
5. Spine Care Center, Wakayama Medical University Kihoku Hospital
6. Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University
7. Sumiya Orthopaedic Hospital
8. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine
9. Department of Orthopaedics/Rheumatology, Nagoya University Graduate School of Medicine
10. Department of Orthopaedic Surgery, Yamaguchi Rosai Hospital
11. Department of Orthopaedic Surgery, University of Yamanashi
12. Department of Orthopaedic Surgery, Dokkyo Medical University
13. Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba
14. Department of Orthopaedic Surgery, Kitasato University School of Medicine
15. Department of Orthopaedic Surgery, University of the Ryukyus, Faculty of Medicine
16. Department of Orthopaedic Surgery, Wakayama Medical University
17. Department of Medical Statistics, Osaka City University Graduate School of Medicine and Faculty of Medicine
18. Department of Orthopaedic Surgery, Osaka Rosai Hospital
19. Department of Orthopaedic Surgery, National Hospital Organization, Hokkaido Medical Center
20. Department of Orthopaedic Surgery, Nagoya City University, Graduate School of Medical Sciences
21. Osaka Yukioka College of Health Science
22. Department of Healthcare Economics and Health Policy, Graduate School of Medicine, The University of Tokyo
23. Department of Orthopaedic Surgery, Japan Medical Alliance, Ebina General Hospital