1. Anaesthetic Department, Portsmouth Hospitals Trust, Queen Alexandra Hospital, Portsmouth, United Kingdom.
2. The BMJ, BMA House, Tavistock Square, London, United Kingdom.
3. Intensive Care Department, Northern General Hospital, Sheffield, United Kingdom.
4. Faculty of Science and Technology, University of Westminster, London, United Kingdom.
5. School of Exercise and Sports Sciences, Università degli Studi di Milano, Milan, Italy.
6. Extremes Research Group, School of Sport, Health and Exercise Sciences, Bangor University, Bangor, United Kingdom.