1. Division of Trauma and Surgical Critical Care, Vanderbilt University Medical Center, Nashville, Tennessee.
2. Department of Surgery, Division of Trauma/Critical Care, University of North Carolina School of Medicine, Chapel Hill, North Carolina.
3. Department of Surgery, University of Washington Harborview Medical Center, Seattle, Washington.
4. Department of Surgery, Brown University, Rhode Island Hospital, Providence, Rhode Island.
5. Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee.
6. Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland.
7. Department of Surgery, New York Weill Cornell Center, New York Presbyterian Hospital, New York, New York.