1. University Hospital Southampton NHS Foundation Trust; Anaesthesia and Critical Care Research Unit; Southampton UK
2. Southampton University Hospitals NHS Trust and the University of Southampton; Southampton NIHR Respiratory Biomedical Research Unit; Southampton UK
3. University of Southampton; Integrative Physiology and Critical Illness Group, Clinical and Experimental Sciences, Faculty of Medicine; Southampton UK
4. University College London; Centre for Altitude Space and Extreme Environment Medicine, Institute for Human Health and Performance; London UK
5. Prince of Wales Clinical School, University of NSW; Department of Anaesthesia; Sydney NSW Australia
6. Prince of Wales Hospital; Wales Anaesthesia; Sydney Australia
7. The Alfred Hospital; Department of Intensive Care and Hyperbaric Medicine; Melbourne Australia
8. Monash University; Department of Epidemiology and Preventive Medicine; Melbourne Australia