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机构:
Univ Ottawa, OMNI Res Grp, Dept Obstet & Gynecol, Fac Med, Ottawa, ON K1H 8L6, Canada
Ottawa Hosp, Res Inst, Clin Epidemiol Program, Ottawa, ON K1H 8L6, Canada
Univ Ottawa, Dept Epidemiol & Community Med, Ottawa, ON K1H 8M5, Canada
Cent South Univ, Sch Publ Hlth, Changsha 410078, Hunan, Peoples R China Southern Med Univ, Nanfang Hosp, Dept Obstet, Guangzhou, Guangdong, Peoples R China