1. Orthopedic Laboratory of Chongqing Medical University, Chongqing 40016, P. R. China
2. Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P. R. China
3. Department of Nursing, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P. R. China
4. Department of Orthopedics, Chongqing University Three Gorges Hospital, Wanzhou, Chongqing 404000, P. R. China
5. Department of Orthopaedics, Children’s Hospital of Chongqing Medical University, Chongqing 400014, P. R. China
6. Ministry of Education Key Laboratory of Child, Children’s Hospital of Chongqing Medical University, Chongqing 400014, P. R. China