1. Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
2. OMNI Research Group, Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
3. Department of Obstetrics and Gynecology, Dalhousie University, Halifax, NS B3K 6R8, Canada
4. Dalla Lana School of Public Health, University of Toronto, Toronto, ON M5T 3M7, Canada
5. Department of Obstetrics and Gynecology, Queen’s University, Kingston, ON K7L 2V7, Canada