1. Department of Neurosurgery, The Second Affiliated Hospital of Hengyang Medical College, Hengyang, 421000 Hunan, China
2. Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, 130000 Jilin, China
3. Department of Radiation Oncology, The Second Hospital of Jilin University, Changchun 130022, China