1. King’s College Hospital NHS Foundation Trust, London, UK
2. Medicine, University College London, London, UK
3. University College London Centre for Altitude, Space, and Extreme Environment Medicine, University College London Hospitals National Institute for Health Research Biomedical Research Centre, Institute of Sport and Exercise Health, London, UK
4. Department of Old Age Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, Kings College London, London, UK
5. Medicine, St George’s, University of London, London, UK
6. Imperial College School of Medicine, Imperial College London, London, UK
7. Department of Child Health, The Royal Free NHS Foundation Trust, London, UK