1. Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
2. Department of Orthopaedic Surgery, Kurume University School of Medicine, Kurume, Japan
3. Department of Orthopaedic Surgery, Saitama Medical Center, Jichi Medical University, Saitama, Japan
4. Division of Musculoskeletal Oncology, National Cancer Center Hospital, Tokyo, Japan