1. Department of Critical Care, Guy's & St Thomas’ NHS Foundation Trust
2. Centre for Human & Applied Physiological Sciences, School of Basic & Medical Biosciences
3. Florence Nightingale Faculty of Nursing, Midwifery, and Palliative Care, King's College London, London, UK
4. Department of Critical Care, R Adams Cowley Shock Trauma Center, University of Maryland Medical Center, Baltimore, Maryland
5. Department of Surgery, Upstate Medical University, Syracuse, New York, USA