1. Department of Neurosurgery, Shanghai First People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200080, P.R. China
2. Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R. China
3. Department of Neurosurgery, The Affiliated Hospital of Medical School of Ningbo University, Ningbo, Zhejiang 315020, P.R. China