[1] Sichuan Univ, West China Hosp, Dept Neurosurg, Chengdu 610041, Peoples R China
[2] North Sichuan Med Coll, Dept Neurosurg, Affiliated Hosp, Nanchong 637000, Peoples R China
[3] North Sichuan Med Coll, Neurosurg Res Ctr, Affiliated Hosp, Nanchong, Peoples R China
[4] Guangyuan Cent Hosp, Dept Neurosurg, Guangyuan, Peoples R China
[5] North Sichuan Med Coll, Coll Med Imaging, Nanchong, Peoples R China
[6] North Sichuan Med Coll, Coll Clin Med, Nanchong, Peoples R China