1. Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland.
2. Center for Shock, Trauma, and Anesthesiology Research, University of Maryland School of Medicine, Baltimore, Maryland.
3. Department of Psychiatry, Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, Maryland.
4. Program in Trauma, Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland.
5. Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, Michigan.