1 Division of Trauma and Acute Care Surgery, Department of Surgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
2 Division of Traumatology, Surgical Critical Care and Emergency Surgery, Department of Surgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
3 Department of Surgery, Department of Anesthesiology and Critical Care Medicine, Department of Emergency Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA.
4 Department of Health Policy and Management, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
5 Division of Trauma and Acute Care Surgery, Department of Surgery, Los Angeles General Medical Center, Los Angeles, California, USA.
6 Division of Trauma and Acute Care Surgery, Department of Surgery, The University of Alabama at Birmingham Hospital, Birmingham, Alabama, USA.