1 Department of Neurosurgery, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China.
2 Department of Neurosurgery, Yixing People's Hospital, Yixing, Jiangsu, China.
3 Department of Neurosurgery, Suzhou Municipal Hospital, Suzhou, Jiangsu, China.
4 Department of Neurosurgery, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China. Electronic address: jijing@njmu.edu.cn.