1. Department of Emergency Medicine; University of Pennsylvania; Philadelphia Pennsylvania USA
2. Division of Traumatology; Department of Surgery; Surgical Critical Care, and Emergency Surgery; University of Pennsylvania; Philadelphia Pennsylvania USA
3. Center for Clinical Epidemiology and Biostatistics; University of Pennsylvania; Philadelphia Pennsylvania USA
4. Department of Surgery; University of Pennsylvania; Philadelphia Pennsylvania USA
5. Division of Endocrine and Oncologic Surgery; Department of Surgery; University of Pennsylvania; Philadelphia Pennsylvania USA