1. Department of Surgery, Bethune School of Medics, Shijiazhuang 050000, China
2. Department of Orthopaedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China
3. Research Service, VA Greater Los Angeles Healthcare System, North Hills, California 91343, United States
4. Division
of Orthopaedic Surgery, Department of Surgery, University of Nevada School of Medicine, Las Vegas, Nevada 89102, United States
5. Department of Material Science, Tianjin University, Tianjin 300072, China
6. Department
of Orthopaedic Surgery, University of Southern California, Los Angeles, California 90033, United States