1. Department of Obstetrics and Gynaecology, Queen’s University, Kingston, Ontario, Canada
2. ICES, Toronto, Ontario, Canada
3. Department of Medicine, Obstetrics and Gynaecology, and Research Institute, McGill University Health Centre, Montreal, Quebec, Canada
4. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada
5. Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
6. Women’s College Hospital and Women’s College Research Institute, Toronto, Ontario, Canada
7. Department of Medicine and Obstetrics and Gynaecology, Temerty Faculty of Medicine, St Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada