1. University of Maryland School of Medicine, Division of Trauma Anesthesiology, Program in Trauma, R Adams Cowley Shock Trauma Center; Department of Anesthesiology; Baltimore MD USA 21201
2. University of Maryland School of Medicine; Department of Emergency Medicine; Paca-Pratt Building 110 S. Paca Street, 4S-127 Baltimore Maryland USA 21201-1559
3. Maryland Institute for Emergency Medical Services Systems; 653 W Pratt Street Baltimore MD USA 21201
4. R. Adams Cowley Shock Trauma Center, University of Maryland; Trauma Anaesthesiology; Department of Anesthesiology Baltimore MD USA 21201
5. London School of Hygiene & Tropical Medicine; Cochrane Injuries Group; Keppel Street London UK WC1E 7HT
6. Hamad General Hospital & Weill Cornell Medical College in Qatar; Department of Emergency Medicine; Doha Qatar