1. Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing 400037, P.R. China
2. Department of Orthopedics, Xi'nan Hospital, Army Medical University, Chongqing 400037, P.R. China
3. Department of Orthopedics, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China