1. Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences University of Fukui, Fukui, Japan.
2. Department of Orthopaedic 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, Nagoya University Graduate School of Medicine, Nagoya, Japan.
5. Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
6. Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, Ibaraki,Japan.
7. Department of Orthopaedic Surgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan.
8. Department of Orthopaedic Surgery, Sapporo Medical University, Sapporo, Japan.
9. Department of Orthopaedic Surgery, Matsuda Orthopedic Memorial Hospital, Sapporo, Japan.
10. Department of Orthopaedic Surgery, Graduate school of Medicine, Chiba University, Chiba, Japan.
11. Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Shizuoka, Japan.
12. Department of Orthopaedic Surgery, Nagoya Kyoritsu Hospital, Aichi, Japan.
13. Department of Orthopaedic Surgery, Kitasato University School of Medicine, Kanagawa,Japan.
14. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine,Osaka, Japan.