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机构:
Tongji Univ, Shanghai Matern & Infant Hosp 1, Shanghai Womens Hlth Inst, Shanghai, Peoples R China
Cent S Univ, Changsha, Hunan, Peoples R China
Univ Ottawa, Fac Med, OMNI Res Grp, Dept Obstet & Gynecol, Ottawa, ON K1H 8L6, Canada
Ottawa Hlth Res Inst, Clin Epidemiol Program, Ottawa, ON, Canada
Univ Ottawa, Fac Med, Dept Epidemiol & Community Med, Ottawa, ON, Canada Tongji Univ, Shanghai Matern & Infant Hosp 1, Shanghai Womens Hlth Inst, Shanghai, Peoples R China