1. Department of Orthopaedic Surgery; School of Medicine, Keio University; Tokyo Japan
2. Division of Musculoskeletal Oncology; National Cancer Center Hospital; Tokyo Japan
3. Department of Orthopaedic Surgery; Kyushu University; Fukuoka Japan
4. Department of Orthopaedic Surgery; Hokkaido Cancer Center; Hokkaido Japan
5. Department of Orthopaedic Surgery; Nagasaki University; Nagasaki Japan
6. Department of Orthopaedic Surgery; Hyogo Cancer Center; Akashi Japan
7. Department of Orthopaedic Surgery; National Hospital Organization Osaka National Hospital; Osaka Japan