[1] Sichuan Univ, West China Hosp, Dept Intens Care Unit, Chengdu, Sichuan, Peoples R China
[2] Sichuan Univ, West China Hosp, Dept Neurosurg, 37 Guoxue Alley, Chengdu 610041, Sichuan, Peoples R China
[3] Peoples Hosp Leshan, Dept Neurosurg, Leshan, Peoples R China
[4] Southwest Med Univ, Affiliated Hosp, Dept Neurosurg, Luzhou, Peoples R China