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Xi An Jiao Tong Univ, Hlth Sci Ctr, Sch Publ Hlth, Dept Epidemiol & Hlth Stat, 76 Yanta West Rd, Xian 710061, Shaanxi, Peoples R China
Northwest Womens & Childrens Hosp, Dept Obstet & Gynecol, Xian 710054, Shaanxi, Peoples R China Xi An Jiao Tong Univ, Hlth Sci Ctr, Sch Publ Hlth, Dept Epidemiol & Hlth Stat, 76 Yanta West Rd, Xian 710061, Shaanxi, Peoples R China