1. Program in Trauma, Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland,
2. Program in Trauma, Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland
3. Department of Anesthesiology, National Study Center for Trauma and EMS, University of Maryland School of Medicine, Baltimore, Maryland
4. Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
5. Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland