1. Department of Obstetrics and Gynaecology University of British Columbia and the Children's and Women's Hospital and Health Centre of British Columbia Vancouver British Columbia Canada
2. School of Population and Public Health University of British Columbia Vancouver British Columbia Canada
3. Department of Obstetrics and Gynecology, Evidence and Impact McMaster University Hamilton Ontario Canada
4. Department of Health Research Methods, Evidence and Impact McMaster University Hamilton Ontario Canada
5. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet Stockholm Sweden
6. Department of Pediatrics, Faculty of Medicine Université Laval Quebec City Quebec Canada
7. Reproduction, Mother and Youth Health and Population Health and Optimal Health Practices Units CHU de Québec‐Université Laval Research Center Quebec City Quebec Canada
8. Division of Maternal‐Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA
9. Division of Epidemiology and Biostatistics, Department of Obstetrics, Gynecology and Reproductive Sciences Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA
10. Cardiovascular Institute of New Jersey and Department of Medicine Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey USA
11. Department of Biostatistics and Epidemiology Rutgers School of Public Health Piscataway New Jersey USA
12. Environmental and Occupational Health Sciences Institute Rutgers Robert Wood Johnson Medical School Piscataway New Jersey USA