1. Department of Medicine; University of Washington; Seattle WA USA
2. University College London Centre for Altitude Space and Extreme Environment Medicine, University College London Hospitals National Institute for Health Research (UCLH NIHR) Biomedical Research Centre; Institute of Sport and Exercise Health; London UK
3. Anaesthesia and Critical Care Research Unit; University Hospital Southampton National Health Service Foundation Trust; Southampton UK
4. Integrative Physiology and Critical Illness Group, Division of Clinical and Experimental Sciences, Faculty of Medicine; University of Southampton; Southampton UK
5. Southampton National Institutes for Health Research (NIHR) Respiratory Biomedical Research Unit; Southampton UK
6. Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton; Southampton General Hospital; Southampton UK
7. Warwick Medical School; University of Warwick; Coventry UK
8. Medical Service; Veterans Affairs (VA) Puget Sound Health Care System; Seattle WA USA