1. Center for Trauma and Critical Care, Department of Surgery, George Washington University, Washington, DC, USA
2. Department of Surgery, Division of Traumatology, Surgical Critical Care, and Emergency Surgery, University of Pennsylvania, Philadelphia, PA, USA
3. Department of Surgery at the University of Rochester Medical Center, Rochester, NY, USA
4. Department of Surgery at Duke Medical Center, University of Pennsylvania Perelman School of Medicine, Durham, NC, USA