1. Department of Orthopaedic Surgery, University of Tokyo
2. Department of Spine and Orthopedic Surgery, Japanese Red Cross Medical Center
3. Department of Orthopaedic Surgery, Japan Organization of Occupational Health and Safety Kanto Rosai Hospital
4. Department of Orthopaedic Surgery, Japan Organization of Occupational Health and Safety Yokohama Rosai Hospital
5. Spine Center, Toranomon Hospital
6. Department of Spinal Surgery, Japan Community Health-Care Organization Tokyo Shinjuku Medical Center
7. Department of Orthopaedic Surgery, Japanese Red Cross Musashino Hospital
8. Department of Orthopaedic Surgery, Japanese Red Cross Saitama Hospital
9. Department of Orthopaedic Surgery, Inanami Spine and Joint Hospital
10. Department of Orthopaedic Surgery, NTT Medical Center Tokyo
11. Department of Orthopaedic Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
12. Department of Orthopaedic Surgery, NHO Sagamihara National Hospital
13. Department of Orthopaedic Surgery, Tokyo Metropolitan Tama Medical Center