1. Centre of Altitude, Space, and Extreme Environment (CASE) Medicine, Portex unit, Institute of Child Health, University College London, London, United Kingdom.
2. NIHR University College London Hospitals Biomedical Research Centre, London, United Kingdom.
3. Integrative Physiology and Critical Illness Group, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom.
4. Anaesthesia and Critical Care Research Unit, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom.
5. NIHR Southampton Respiratory Biomedical Research Unit, Southampton, United Kingdom.