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1 School of Clinical Sciences, University of Bristol, UK; 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 Liverpool and Macquarie University Hospitals, Australia; University of New South Wales and Macquarie University, Sydney, Australia. Electronic address: m.parr@unsw.edu.au.
4 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.
1 School of Clinical Sciences, University of Bristol, UK; 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 Liverpool and Macquarie University Hospitals, Australia; University of New South Wales and Macquarie University, Sydney, Australia. Electronic address: m.parr@unsw.edu.au.
4 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.