1. Division of Traumatology, Surgical Critical Care & Emergency Surgery, Department of Surgery Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania USA
2. Department of Biostatistics, Epidemiology and Informatics University of Pennsylvania Philadelphia Pennsylvania USA
3. Department of Emergency Medicine University of New Mexico School of Medicine Albuquerque New Mexico USA
4. Trauma and Acute Care Surgery, Department of Surgery The University of Chicago Chicago Illinois USA
5. Department of Surgery Uniformed Services University F. Edward Hébert School of Medicine Bethesda Maryland USA