1. Department of Orthopedic Surgery, Osaka International Cancer Institute, Osaka 541‑8567, Japan
2. Department of Diagnostic Pathology and Cytology, Osaka International Cancer Institute, Osaka 541‑8567, Japan
3. Department of Orthopedic Surgery, Osaka University Hospital, Suita, Osaka 565‑0871, Japan
4. Department of Pathology, Kyoto Prefectural University of Medicine, Kyoto 602‑8566, Japan