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 Pathology, University of Maryland School of Medicine, Baltimore, Maryland.
4. Pathology Service, Veterans Affairs Medical Center, Baltimore, Maryland.
5. Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, Maryland.
6. Department of Surgery, Program in Trauma, University of Maryland School of Medicine, Baltimore, Maryland.
7. Division of Biostatistics and Bioinformatics, Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland.