1. 1Department of Anesthesiology, University of Maryland School of Medicine; Program in Trauma, R Adams Cowley Shock Trauma Center, Baltimore, Maryland.
2. 2Department of Surgery, University of Maryland School of Medicine; Program in Trauma, R Adams Cowley Shock Trauma Center, Baltimore, Maryland.
3. 3Department of Surgery, University of Maryland School of Medicine; Program in Trauma, R Adams Cowley Shock Trauma Center, Baltimore, Maryland.