1. Trauma Division, Vanderbilt University, Nashville, Tennessee.
2. Department of Surgery, University of Washington, Harborview Medical Center, Seattle, Washington.
3. Department of Surgery, University of Colorado, Denver, Colorado.
4. Department of Surgery, Virginia Commonwealth University, Richmond, Virginia.
5. Department of Surgery, University of Michigan, Ann Arbor, Michigan.
6. Department of Surgery, University of Pittsburgh, Pittsburgh, Pensylvania.