1 Department of Neurosurgery, West China Hospital, Sichuan University, No.37 Guo Xue Avenue, Chengdu, 610041, Sichuan province, People's Republic of China.
2 Department of Neurosurgery, West China Hospital, Sichuan University, No.37 Guo Xue Avenue, Chengdu, 610041, Sichuan province, People's Republic of China. [email protected].