1. Department of Orthopedic Surgery, Yamaguchi University Graduate School of Medicine
2. Department of Orthopedic Surgery, Osaka Medical College
3. Department of Orthopaedic Surgery, Faculty of Medicine, Fukushima Medical University, School of Medicine
4. Spine Center, Ehime University Hospital
5. Department of Orthopaedic Surgery, Tohoku University School of Medicine
6. Department of Orthopedic Surgery, Akita University Graduate School of Medicine
7. Department of Orthopaedic Surgery, Graduate School of Medical Science Kanazawa University
8. Department of Orthopaedic Surgery, Hyogo Rehabilitation Center Hospital