1. Department of Bone and Soft Tissue Tumors, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
2. Central Laboratory, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
3. Department of Trauma and Orthopedics, Peking University People’s Hospital, Beijing 100044, P.R. China