1. Department of Orthopaedics, Hong Hui Hospital, Medical College of Xi’an Jiaotong University, Xi’an 710054, P. R. China
2. Science and Techonology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710068, P. R. China
3. Department of Human Movement Studies, Xi’an Physical Education University, Xi’an 710068, P. R. China
4. Department of Orthopaedics, Xijing Hospital, The Fourth Military Medical University, Xi’an 710032, P. R. China
5. Biomanufacturing Center, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China