1 Department of Obstetrics and Gynaecology, The University of British Columbia, Vancouver, BC; Contraception and Abortion Research Team, Women's Health Research Institute, BCWomen's Hospital and Health Centre, Vancouver, BC.
2 Contraception and Abortion Research Team, Women's Health Research Institute, BCWomen's Hospital and Health Centre, Vancouver, BC; Department of Family Practice, The University of British Columbia, Vancouver, BC; Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK.
3 Contraception and Abortion Research Team, Women's Health Research Institute, BCWomen's Hospital and Health Centre, Vancouver, BC; Department of Family Practice, The University of British Columbia, Vancouver, BC.
4 Department of Obstetrics and Gynaecology, The University of British Columbia, Vancouver, BC; Contraception and Abortion Research Team, Women's Health Research Institute, BCWomen's Hospital and Health Centre, Vancouver, BC; Centre for Health Evaluation and Outcome Sciences, The University of British Columbia, Vancouver, BC.
5 Planned Parenthood Ottawa, Ottawa, ON.
6 Department of Obstetrics and Gynaecology, The University of British Columbia, Vancouver, BC; Contraception and Abortion Research Team, Women's Health Research Institute, BCWomen's Hospital and Health Centre, Vancouver, BC; Centre for Health Evaluation and Outcome Sciences, The University of British Columbia, Vancouver, BC. Electronic address: sarah.munro@ubc.ca.