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