1. Department of Anaesthesia, Sydney Adventist Hospital, Wahroonga, New South Wales, Australia
2. Department of Anaesthesia, Sydney Adventist Hospital, Wahroonga, New South Wales, Sydney Medical School, University of Sydney, Sydney, New South Wales
3. James Cook University, Townsville, Queensland
4. Sydney Medical School, University of Sydney, Sydney, New South Wales
5. Macquarie University, Sydney, New South Wales
6. Department of Anaesthesia, Sydney Adventist Hospital, Wahroonga, Sydney Medical School, University of Sydney, Sydney, New South Wales