1 University of Warwick, Warwick Medical School, Coventry, CV4 7AL, UK; Royal United Hospital, Bath, BA1 3NG, UK. Electronic address: [email protected].
2 Department of Emergency Medicine, Virginia Commonwealth University Health System, Richmond, VA, USA. Electronic address: [email protected].
3 Liverpool and Macquarie University Hospitals, University of New South Wales and Macquarie University, Sydney, Australia. Electronic address: [email protected].
4 University of Warwick, Warwick Medical School and University Hospitals Birmingham NHS Foundation Trust, Coventry, CV4 7AL, UK. Electronic address: [email protected].