Simon Hendel1,2, Anthony R Absalom3. 1. From the Department of Anaesthesia and Perioperative Medicine, The Alfred Hospital, Melbourne, Victoria, Australia. 2. Department of Anesthesia and Perioperative Medicine, Monash University, Melbourne, Victoria, Australia. 3. Department of Anesthesiology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.