1. Department of Obstetrics and Gynaecology; University of Sherbrooke; Sherbrooke QC Canada
2. Research Centre of Sainte-Justine Hospital; University of Montreal; Montreal QC Canada
3. Department of Anesthesiology; Sainte-Justine Hospital; Montreal QC Canada
4. Department of Anesthesiology; CHUM; Montreal QC Canada
5. Department of Obstetrics and Gynaecology; Lasalle Hospital; Montreal QC Canada
6. Department of Epidemiology and Biostatistics; McGill University; Montréal QC Canada
7. Department of Obstetrics and Gynaecology; CHUM; Montreal QC Canada