1. Centre for Medical and Health Sciences Education, School of Medicine, University of Auckland, Grafton,Auckland 1023, New Zealand
2. Department of Medical Education, Melbourne Medical School, The University of Melbourne, Parkville, VIC 3010, Australia
3. Department of Anaesthesiology, School of Medicine, The University of Auckland, Grafton, Auckland 1023, New Zealand
4. Honorary Consultant, Department of Anaesthesia and Perioperative Care, Auckland City Hospital, Park Rd, Grafton, Auckland 1023, New Zealand