1 Department of Neuroanaesthesia, National Hospital of Neurology and Neurosurgery, University College London Hospitals, Queens Square, London, UK.
2 Department of Anesthesiology, Pharmacology, and Therapeutics Vancouver General Hospital, University of British Columbia, Vancouver, BC, Canada.
3 Department of Anesthesiology and Critical Care, Centre Hospitalier Universitaire de Québec, Hôpital Enfant-Jésus, Laval University, Québec, QC, Canada.
4 Department of Anesthesiology, Pharmacology, and Therapeutics Vancouver General Hospital, University of British Columbia, Vancouver, BC, Canada. Alana.flexman@vch.ca.