1. First Clinical Medical College, Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
2. Institute of Medical Sciences, General Hospital of Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
3. Orthopedics Ward 3, The General Hospital of Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
4. Orthopedics Ward 3, The General Hospital of Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
5. Ningxia Institute of Osteoarthropathy, General Hospital of Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
6. School of Education, Ningxia University, Yinchuan, Ningxia Hui 750004, P.R. China