1. UCLH NIHR Biomedical Research Centre, Institute of Sport and Exercise Health; University College London Centre for Altitude Space and Extreme Environment (CASE) Medicine; London UK
2. University of Southampton; Integrative Physiology and Critical Illness Group; Southampton UK
3. St. George's Hospital; General Intensive Care Unit; 1st Floor St. James wing Blackshaw Road London UK SW17 0QT
4. University College London; Department Anaesthesia and Critical Care; 1st Floor Maple House 149 Tottenham Court Road London UK WC1E 6DB
5. Intensive Care National Audit & Research Centre; Napier House 24 High Holborn London UK WC1V 6AZ