Xiujing Qi1, Feng Gao2, Yingyan Zhang3, Lisha Zhou4. 1. Department of Neurosurgery, Jinan People's Hospital Affiliated to Shandong First Medical University, Jinan, China - sdlwqj@126.com. 2. Department of Oncology, Jinan People's Hospital Affiliated to Shandong First Medical University, Jinan, China. 3. Department of Hematology, Jinan People's Hospital Affiliated to Shandong First Medical University, Jinan, China. 4. Department of Neurosurgery, Jinan People's Hospital Affiliated to Shandong First Medical University, Jinan, China.