1 Warwick Research in Nursing, Division of Health Sciences, Warwick Medical School, Warwick University, Gibbet Hill, Coventry CV4 7AL, UK. Electronic address: K.L.Haywood@warwick.ac.uk.
2 Warwick Research in Nursing, Division of Health Sciences, Warwick Medical School, Warwick University, Gibbet Hill, Coventry CV4 7AL, UK.
3 Oxford Trauma and Emergency Care, Kadorie Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK; Trauma and Major Trauma Centre, Oxford University Hospitals NHS Foundation Trust, John Radcliffe Hospital, Oxford, UK.