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 Departments of Obstetrics and Gynecology and Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Ontario, Canada.
4 Clinical Epidemiology Division, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden.
5 Department of Pediatrics, Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada.
6 Reproduction, Mother and Youth Health and Population Health and Optimal Health Practices Units, CHU de Québec-Université Laval Research Center, Quebec City, Quebec, Canada.
7 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, NYU Grossman School of Medicine, New York, USA.
8 Division of Epidemiology and Biostatistics, Department of Obstetrics, Gynecology and Reproductive Sciences, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA.
9 Cardiovascular Institute of New Jersey and Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA.
10 Department of Biostatistics and Epidemiology, Rutgers School of Public Health, Piscataway, New Jersey, USA.
11 Environmental and Occupational Health Sciences Institute, Rutgers Robert Wood Johnson Medical School, Piscataway, New Jersey, USA.