1. Departments of Anesthesia, St. Joseph’s Healthcare, Hamilton, Ontario, Canada
2. Medicine, St. Joseph’s Healthcare, Hamilton, Ontario, Canada
3. Clinical Epidemiology and Biostatistics, St. Joseph’s Healthcare, Hamilton, Ontario, Canada
4. Michael DeGroote School of Medicine, McMaster University, St Joseph’s Healthcare, Hamilton, Ontario, Canada
5. Biostatistics Unit, St. Joseph’s Healthcare, Hamilton, Ontario, Canada