1. Intensive Care Unit
2. Department of Respiratory Medicine, and
3. Department of Medicine, Melbourne Medical School, University of Melbourne, Royal Melbourne Hospital, Parkville, Victoria, Australia
4. Australian and New Zealand Intensive Care Research Centre, School of Public Health and Preventive Medicine, Monash University, and
5. Department of Intensive Care and Hyperbaric Medicine, Alfred Hospital, Prahran, Victoria, Australia
6. The Australian and New Zealand Intensive Care Society Centre for Outcome and Resource Evaluation, Camberwell, Victoria, Australia
7. Intensive Care Unit, Austin Hospital, Heidelberg, Victoria, Australia
8. Discipline of Acute Care Medicine, University of Adelaide, Adelaide, South Australia, Australia
9. Intensive Care Unit, Wellington Regional Hospital, Wellington South, New Zealand; and
10. Medical Research Institute of New Zealand, Wellington, New Zealand