1. Department of Orthopedics, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050051, P.R. China
2. The Second Department of Intensive Care Unit, Children's Hospital of Hebei Province, Shijiazhuang, Hebei 050000, P.R. China
3. Department of Medical Records, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050051, P.R. China