1. Department of Orthopaedic Surgery, Belland General Hospital, Sakai, Osaka 599‑8247, Japan
2. Department of Pathology and Cytology, Osaka International Cancer Institute, Chuo‑ku, Osaka 541‑8567, Japan
3. Department of Orthopaedic Surgery, Osaka International Cancer Institute, Chuo‑ku, Osaka 541‑8567, Japan
4. Department of Orthopaedic Surgery, Japanese Red Cross Society Himeji Hospital, Himeji, Hyogo 670‑8540, Japan