1. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
2. Department of Orthopaedics, Xijing Hospital, the Fourth Military Medical University, Xi'an, 710032, P. R. China
3. State Agencies Drug Clinical Trials, the 210th Hospital of PLA, DaLian, 116021, P. R. China