1. Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada
2. Department of Family and Community Medicine, University of Toronto, Toronto, ON, Canada
3. Department of Obstetrics, Gynecology and Reproduction, Laval University, Québec City, Québec, Canada
4. Department of Family Practice, University of British Columbia, Vancouver, British Columbia, Canada
5. Faculty of Public Health and Policy, London School of Hygiene & Tropical Medicine, London, United Kingdom