1. Department of Emergency Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
2. Division of Trauma and General Surgery, Department of Surgery, Pittsburgh Trauma Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
4. Department of Surgery, University of Texas Health San Antonio, San Antonio
5. Department of Surgery, University of Utah, Salt Lake City
6. Department of Surgery, University of Arizona, Tucson