[1] Univ British Columbia, Dept Obstet & Gynecol, Vancouver, BC V5Z 1M9, Canada
[2] Univ British Columbia, Dept Med, Vancouver, BC, Canada
[3] Univ British Columbia, Dept Anesthesia Pharmacol & Therapeut, Vancouver, BC V5Z 1M9, Canada
[4] Univ British Columbia, Dept Elect & Comp Engn, Vancouver, BC V5Z 1M9, Canada
[5] Univ British Columbia, Child & Family Res Inst, Vancouver, BC V5Z 1M9, Canada
[6] Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, San Francisco, CA USA
[7] Univ Calif San Francisco, Bixby Ctr Global Reprod Hlth, San Francisco, CA USA
[8] Univ Edinburgh, Queens Med Res Inst, MRC Ctr Reprod Hlth, Edinburgh EH8 9YL, Midlothian, Scotland
[9] Univ Washington, Dept Global Hlth, Seattle, WA 98195 USA
[10] Kings Coll London, Div Womens Hlth, London, England
[11] Univ Toronto, Hosp Sick Children, Ctr Global Child Hlth, Toronto, ON M5G 1X8, Canada
[12] Aga Khan Univ, Ctr Excellence Women & Child Hlth, Karachi, Pakistan