[1] Army Med Univ, Third Mil Med Univ, Southwest Hosp, Dept Neurosurg, Chongqing 400038, Peoples R China
[2] Siping Cent Peoples Hosp, Dept Neurosurg, Siping, Jilin, Peoples R China
[3] Wuzhou Gongren Hosp, Dept Neurosurg, Wuzhou, Guangxi, Peoples R China
[4] Wuhan Univ, Dept Neurosurg, Renmin Hosp, Wuhan, Hubei, Peoples R China
[5] Hejiang Cty Peoples Hosp, Dept Neurosurg, Luzhou, Sichuan, Peoples R China
[6] Dazhu Cty Peoples Hosp, Dept Neurosurg, Dazhou, Sichuan, Peoples R China
[7] Army Med Univ, Third Mil Med Univ, Coll Prevent Med, Dept Epidemiol, Chongqing, Peoples R China