1. Department of Orthopedic Surgery, Kyushu Rosai Hospital, Kitakyushu, Fukuoka, Japan
2. Department of Orthopaedic Surgery, Kyushu Rosai Hospital, Kitakyushu, Fukuoka, Japan
3. Department of Musculoskeletal Oncology, National Cancer Center Hospital, Tokyo, Japan
4. Department of Pathology, Kyushu Rosai Hospital, Kitakyushu, Fukuoka, Japan
5. Department of Pathology and Oncology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan