1. Department of Surgery, R. Adams Cowley Shock Trauma Center Division of Clinical and Outcomes Research University of Maryland School of Medicine, Baltimore, Maryland.
2. Department of Medicine, R. Adams Cowley Shock Trauma Center Division of Clinical and Outcomes Research University of Maryland School of Medicine, Baltimore, Maryland.
3. Department of Epidemiology, R. Adams Cowley Shock Trauma Center Division of Clinical and Outcomes Research University of Maryland School of Medicine, Baltimore, Maryland.