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Xi An Jiao Tong Univ, Affiliated Hosp 1, Dept Obstet & Gynecol, Maternal & Child Hlth Ctr, 277 West Yanta Road, Xian 710061, Shaanxi, Peoples R China
Xi An Jiao Tong Univ, Sch Publ Hlth, Hlth Sci Ctr, Xian, Peoples R China Xi An Jiao Tong Univ, Affiliated Hosp 1, Dept Obstet & Gynecol, Maternal & Child Hlth Ctr, 277 West Yanta Road, Xian 710061, Shaanxi, Peoples R China