Grace M Xu1, Kevin Latchford2, Daniel Cordovani3. 1. Michael G DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada. grace.xu@medportal.ca. 2. Department of Anesthesia, Grand River Hospital and St. Mary's General Hospital, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada. 3. Department of Anesthesia, Hamilton Health Sciences, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada.