1. Department of Neurosurgery, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan 250000, Shandong Province, P.R. China
2. Department of Neurosurgery, Liaocheng People’s Hospital, Liaocheng 250000, Shandong Province, P.R. China
3. Department of Neurosurgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250000, Shandong Province, P.R. China
4. Department of Otolaryngology, General Hospital of Central Theater Command of PLA, Wuhan 430070, Hubei, China
5. Department of Senile Neurology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250000, Shandong Province, P.R. China