1. Second Department of Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050035, P.R. China
2. Third Department of Oncology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
3. Department of Orthopedics, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050035, P.R. China