1 1 Department of Neurosurgery, Chinese PLA General Hospital of Jinan Military Command, 25 Shifan Road, Jinan 250031, Shandong Province, China yufeng.yf@163.com zrw90@163.com.
2 2 Department of Radiology, Chinese PLA General Hospital of Jinan Military Command, 25 Shifan Road, Jinan 250031, Shandong Province, China.
3 1 Department of Neurosurgery, Chinese PLA General Hospital of Jinan Military Command, 25 Shifan Road, Jinan 250031, Shandong Province, China.