1. Department of Trauma and Orthopedics, Beijing University People's Hospital, Beijing 100044, P.R. China
2. Department of Orthopedics, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
3. Central Laboratory, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
4. Department of Bone and Soft Tissue Tumors, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
5. Department of General Surgery, Beijing University First Hospital, Beijing 100034, P.R. China