1. Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
2. Department of Obstetrics & Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada
3. Division of Cardiology, Department of Medicine, Toronto Congenital Cardiac Centre for Adults, University of Toronto, Toronto, Ontario, Canada
4. Department of Medicine, University of Calgary, Calgary, Alberta, Canada
5. Department of Obstetrics & Gynaecology, University of Calgary, Calgary, Alberta, Canada