1 University of Montreal Hospital Research Centre, School of Public Health, University of Montreal, Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, and Institut national de santé publique du Québec, Montreal, Quebec, Canada.
2 University of Montreal Hospital Research Centre and Institut national de santé publique du Québec, Montreal, Quebec, Canada.
3 Institut national de santé publique du Québec, and Department of Obstetrics and Gynecology, Sainte-Justine Hospital Research Center, University of Montreal, Montreal, Quebec, Canada.