1. Department of Neurosurgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing People's Republic of China
2. Department of Neurosurgery, The Third People's Hospital of Hefei Hefei Third Clinical College of Anhui Medical University Hefei People's Republic of China
3. Department of Anesthesiology, Beijing Friendship Hospital Capital Medical University Beijing People's Republic of China