1. Department of Radiotherapy, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
2. Department of Central Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
3. MD Anderson Cancer Center, University of Texas Hospital, Houston, Texas 77030, USA
4. Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China