1. Department of Accident and Emergency, Leicester Royal Infirmary, Leicester, UK
2. Trauma Unit, Johannesburg Hospital and University of the Witwatersrand, Johannesburg, South Africa
3. North Western Injury Research Centre, University of Manchester, UK
4. Department of Haematology, School of Pathology of the South African Institute for Medical Research and the University of the Witwatersrand, Johannesburg, South Africa