1. Department of Obstetrics and Gynecology, University of Calgary, Canada
2. Department of Medicine, University of Calgary, Canada
3. Department of Community Health Sciences, University of Calgary, Canada
4. Department of Obstetrics and Gynecology, University of British Columbia, Vancouver, Canada
5. Department of Obstetrics and Gynecology, King Saud University, Riyadh, Saudi Arabia
6. School of Population and Public Health, University of British Columbia, Canada