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Xi An Jiao Tong Univ, Affiliated Hosp 1, Dept Obstet & Gynaecol, 277 Yanta Rd, Xian 710061, Shaanxi, Peoples R China
Harbin Med Univ, Affiliated Hosp 4, Dept Obstet & Gynaecol, Harbin 150000, Heilongjiang, Peoples R China Xi An Jiao Tong Univ, Affiliated Hosp 1, Dept Obstet & Gynaecol, 277 Yanta Rd, Xian 710061, Shaanxi, Peoples R China