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Sichuan Univ, West China Univ Hosp 2, Dept Obstet & Gynecol, 17 Ren Min South Rd, Chengdu 610041, Sichuan, Peoples R China Sichuan Univ, West China Univ Hosp 2, Dept Obstet & Gynecol, 17 Ren Min South Rd, Chengdu 610041, Sichuan, Peoples R China