1. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Osaka 565‑0871, Japan
2. Department of Orthopaedic Surgery, Osaka National Hospital, Chuo‑ku, Osaka 540‑0006, Japan
3. Musculoskeletal Oncology Service, Osaka International Cancer Institute, Chuo‑ku, Osaka 541‑8567, Japan
4. Department of Diagnostic Pathology and Cytology, Osaka International Cancer Institute, Chuo‑ku, Osaka 541‑8567, Japan
5. Department of Orthopaedic Surgery, Bell‑land General Hospital, Sakai, Osaka 599‑8247, Japan
6. Department of Orthopaedic Surgery, Ashiya Municipal Hospital, Ashiya, Hyogo 659‑8502, Japan