1. Department of Radiation Oncology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei�050011, P.R.�China
2. Department of Clinical Laboratory, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei�050011, P.R.�China
3. Research Centre, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei�050011, P.R.�China