1. Department of Orthopedic, Linfen Central Hospital, Linfen, Shanxi Province, China.
2. Department of Orthopedic, Second Hospital of Shanxi Medical University, Taiyuan, Shanxi Province, China.
3. Department of Orthopedic, Fifth Affiliated Hospital of Sun Yat-Sen University, Zhuhai, Guangdong Province, P.R. China.
4. Department of Orthopedic, Xi'an International Medical Center Hospital, Xi'an, Shaanxi Province, China.