1. Department of Radiology, The Fourth Clinical Medical College of Peking University, Beijing Jishuitan Hospital, Beijing 100035, China.
2. Department of Orthopedic Oncology, The Third Hospital of Hebei Medical University, Shijiazhuang 050051, China.
3. Beijing Institute of Traumatology and Orthopedics, Beijing 100035, China.
4. Department of Spine Surgery, The Fourth Clinical Medical College of Peking University, Beijing Jishuitan Hospital, Beijing 100035, China.