1. Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
2. The First Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
3. Department of Neurosurgery, Hangzhou First People's Hospital, Hangzhou, Zhejiang 310006, P.R. China
4. Department of Neurosurgery, Wenzhou Central Hospital, Wenzhou, Zhejiang 325000, P.R. China