1. Department of Orthopaedics, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei 050031, P.R. China
2. Department of General Surgery, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei 050031, P.R. China
3. Department of Pathology, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei 050031, P.R. China