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Fudan Univ, Sch Publ Hlth, Shanghai 200433, Peoples R China
Tongji Univ, Sch Med, Shanghai Matern & Infant Hosp 1, Fetal Med Unit,Dept Obstet, 2699 GaoKe West Rd, Shanghai 200126, Peoples R China
Tongji Univ, Sch Med, Shanghai Matern & Infant Hosp 1, Prenatal Diag Ctr, 2699 GaoKe West Rd, Shanghai 200126, Peoples R China
Shanghai Inst Planned Parenthood Res, WHO Collaborating Ctr Human Reprod, Dept Epidemiol & Social Sci Reprod Hlth, Shanghai, Peoples R China Fudan Univ, Sch Publ Hlth, Shanghai 200433, Peoples R China