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Sichuan Univ, West China Second Univ Hosp, Sichuan Univ West China Sch Nursing, Dept Obstet & Gynecol Nursing, Chengdu, Sichuan, Peoples R China
Sichuan Univ, Key Lab Birth Defects & Related Dis Women & Child, Minist Educ, Chengdu, Sichuan, Peoples R China Sichuan Univ, West China Second Univ Hosp, Sichuan Univ West China Sch Nursing, Dept Obstet & Gynecol Nursing, Chengdu, Sichuan, Peoples R China