[1] Nanjing Univ, Med Sch, Affiliated Hosp, Nanjing Drum Tower Hosp,Dept Radiol, 321 Zhongshan Rd, Nanjing 210008, Peoples R China
[2] Nanjing Univ, Med Sch, Affiliated Hosp, Nanjing Drum Tower Hosp,Dept Obstet & Gynecol, 321 Zhongshan Rd, Nanjing 210008, Peoples R China
[3] Philips Healthcare, Shanghai, Peoples R China