1 School of Clinical Sciences, University of Bristol, UK; Anaesthesia and Intensive Care Medicine, Royal United Hospital, Bath, UK. Electronic address: jerry.nolan@nhs.net.
2 Department of Emergency Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA. Electronic address: ornato@aol.com.
3 Director of Intensive Care, Liverpool and Macquarie University Hospitals, Australia; University of New South Wales and Macquarie University, Sydney, Australia. Electronic address: m.parr@unsw.edu.au.
4 Critical Care Medicine, University of Warwick, Warwick Medical School and Heart of England NHS Foundation Trust, Coventry, CV4 7AL, UK. Electronic address: g.d.perkins@warwick.ac.uk.
5 Anaesthesia and Intensive Care Medicine Southmead Hospital North Bristol NHS Trust, Bristol, BS10 5NB, UK. Electronic address: jasmeet.soar@nbt.nhs.uk.