1. Department of Orthopaedic Surgery, Baoshan Branch of Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, P.R. China
2. Department of spine Surgery, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, P.R. China
3. Department of Anesthesiology, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, P.R. China
4. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, P.R. China