1. Department of Computer Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. Department of Orthopaedics, Chinese PLA General Hospital, Beijing, China
3. Department of Orthopaedics, Beijing Tsinghua Changgung Hospital, Tsinghua University, Beijing, China
4. Department of Biomedical Engineering, Tsinghua University, Beijing, China