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Univ British Columbia, Sch Populat & Publ Hlth, Vancouver, BC V5Z 1M9, Canada
Univ British Columbia, Dept Family Practice, Vancouver, BC V5Z 1M9, Canada
Univ British Columbia, Dept Obstet, Vancouver, BC V5Z 1M9, Canada
Univ British Columbia, Dept Gynecol, Vancouver, BC V5Z 1M9, Canada Univ British Columbia, Child & Family Res Inst, Vaccine Evaluat Ctr, Vancouver, BC V5Z 4H4, Canada