1. Department of Orthopedics Surgery, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan.
2. Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Ishikawa, Japan.
3. Department of Orthopedics Surgery, Toyama Prefectural Central Hospital, Toyama, Japan.
4. Department of Orthopedic Surgery, Graduate School of Medicine, Nagoya University, Nagoya, Japan.
5. Department of Orthopedic Surgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan.
6. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan.
7. Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan.
8. Department of Orthopedic Surgery, National Hospital Organization Murayama Medical Center, Tokyo, Japan.
9. Department of Orthopedic Surgery, Graduate school of Medicine, Chiba University, Chiba, Japan.
10. Department of Orthopedics and Rehabilitation Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan.
11. Department of Orthopedic Surgery, Hamamatsu University School of Medicine, Shizuoka, Japan.
12. Department of Orthopedic Surgery, Sapporo Medical University, Sapporo, Japan.
13. Department of Orthopedic Surgery, Matsuda Orthopedic Memorial Hospital, Sapporo, Japan.
14. Department of Orthopedic Surgery, Shinshu University School of Medicine, Nagano, Japan.
15. Department of Orthopedic Surgery, Kitasato University School of Medicine, Kanagawa, Japan.
16. Department of Orthopedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan.