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Nanjing Univ, Nanjing Drum Tower Hosp, Dept Obstet & Gynecol, Affiliated Hosp,Med Sch, 321 Zhongshan Rd, Nanjing 210008, Peoples R China Nanjing Univ, Nanjing Drum Tower Hosp, Dept Obstet & Gynecol, Affiliated Hosp,Med Sch, 321 Zhongshan Rd, Nanjing 210008, Peoples R China