1. Department of Trauma, Grady Memorial Hospital, Emory University, Atlanta, Georgia, United States
2. Department of Surgery, Grady Memorial Hospital, Emory University, Atlanta, Georgia, United States
3. Department of Critical Care, Grady Memorial Hospital, Emory University, Atlanta, Georgia, United States
4. Department of Critical Care Medicine, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada
5. Department of Surgery, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada
6. The Regional Trauma Program, Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada