1 Department of Anesthesiology, Hospital Maisonneuve-Rosemont, University of Montreal, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada. philipperichebe@live.com.
2 Department of Anesthesiology, Hospital Maisonneuve-Rosemont, University of Montreal, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada.