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Cent S Univ, Dept Epidemiol & Hlth Stat, Sch Publ Hlth, Changsha 410078, Hunan, Peoples R China
Univ Ottawa, Dept Obstet & Gynecol, Fac Med, Ottawa, ON K1H 8L6, Canada
Univ Ottawa, Dept Epidemiol & Community Med, Fac Med, Ottawa, ON K1H 8L6, Canada Cent S Univ, Dept Epidemiol & Hlth Stat, Sch Publ Hlth, Changsha 410078, Hunan, Peoples R China