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Cent South Univ, Xiangya Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Changsha, Hunan, Peoples R China
Univ Ottawa, Dept Obstet & Gynaecol, Ottawa, ON, Canada
Univ Ottawa, Ottawa Hosp Res Inst, Ottawa, ON, Canada Cent South Univ, Xiangya Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Changsha, Hunan, Peoples R China