1. Department of Orthopedic Surgery; Nagoya City University Graduate School of Medical Sciences; Nagoya Aichi Japan
2. Department of Orthopedic Surgery; Graduate School of Medical Sciences; Kanazawa University; Kanazawa Ishikawa Japan
3. Department of Musculoskeletal Oncology; National Cancer Center Hospital; Tokyo Japan
4. Department of Biostatistics; Innovative Clinical Research Center; Kanazawa University; Kanazawa Ishikawa Japan