1 Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada. Electronic address: ksjoseph@bcchr.ca.
2 Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada.
3 Department of Pediatrics, Université Laval, Quebec City, Quebec, Canada.
4 Departments of Obstetrics and Gynecology and Health Research Methods, McMaster University, Hamilton, Ontario, Canada.
5 Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
6 Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
7 Departments of Obstetrics & Gynaecology and Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada.
8 Department of Obstetrics and Gynecology, NYU Grossman School of Medicine, New York, NY.
9 Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.
10 Department of Obstetrics, Gynecology, and Reproductive Sciences, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ.