Affiliation

• ¹ From the *Departments of Physiology & Pharmacology and Anaesthesia, University of Calgary, Cumming School of Medicine, Calgary, Alberta, Canada; †Department of Anesthesia and Critical Care, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Departments of ‡Anesthesia and §Physiology, University of Toronto, Toronto, Ontario, Canada; and ‖Klinik fuer Anaesthesiologie, Universitaetsklinikum Bonn, Bonn, Germany.