[1] Sichuan Univ, Dept Ultrasound, West China Univ Hosp 2, Minist Educ, 20,Sect 3,Renmin South Rd, Chengdu 610041, Sichuan, Peoples R China
[2] Sichuan Univ, Key Lab Birth Defects & Related Dis Women & Child, West China Univ Hosp 2, Minist Educ, 20,Sect 3,Renmin South Rd, Chengdu 610041, Sichuan, Peoples R China
[3] Sichuan Univ, Dept Ultrasound, West China Hosp, 37 Guoxue St, Chengdu 610041, Sichuan, Peoples R China
[4] Sichuan Univ, Dept Radiol, West China Hosp, 37 Guoxue St, Chengdu 610041, Sichuan, Peoples R China
[5] Sichuan Univ, Dept Neurosurg, West China Hosp, 37 Guoxue St, Chengdu 610041, Sichuan, Peoples R China
[6] Sichuan Univ, Dept Ultrasound, Clin Ultrasound Imaging Drug Res Lab, West China Hosp, 37 Guoxue St, Chengdu 610041, Sichuan, Peoples R China