1. School of Public Health, North China University of Science and Technology, Tangshan, China
2. Department of Orthopaedics, Shenzhen Hospital, Southern Medical University, Shenzhen, China
3. Department of Orthopedic Surgery, Tianjin Hospital, Tianjin, China
4. Department of Orthopedic Surgery, Hebei Medical University, Shijiazhuang, China
5. Department of Orthopedic Surgery, Emergency General Hospital, Beijing, China