1. Department of Orthopedics, The Second People's Hospital of Changzhi City, Changzhi, Shanxi 046000, P.R. China
2. Graduate School, Changzhi Medical College, Changzhi, Shanxi 046000, P.R. China
3. Department of Orthopedics, Heping Hospital Affiliated to Changzhi Medical College, Changzhi, Shanxi 046000, P.R. China