1. Department of Obstetrics and Gynaecology University of British Columbia Vancouver BC Canada
2. School of Population and Public Health University of British Columbia Vancouver BC Canada
3. School of Nursing University of British Columbia Vancouver BC Canada
4. Centre for Health Evaluation and Outcome Sciences Providence Health Care Research Institute Vancouver BC Canada
5. Clinical Nurse Specialist Fraser Health Authority Surrey BC Canada
6. Clinical Quality and Systems Improvement Perinatal Services BCProvincial Health Services Authority Vancouver BC Canada
7. Sydney School of Public Health University of Sydney Sydney NSW Australia