1. Division of Trauma Surgery and Surgical Critical Care, University of Southern California, Los Angeles, California;
2. Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, California;
3. Department of Surgery, University of Texas Medical Branch–Brackenridge Hospital, Austin, Texas;
4. Division of Trauma, Critical Care & Emergency Surgery, University of Arizona, Tucson, Arizona; and
5. Department of Surgery, University of Nevada Medical Center, Las Vegas, Nevada